Tonight I started ordering off my true dual build "wish list." I ordered a 3" Flowmaster D-Port merge to act as the main body of my duals. Here's a list of what I've either already got or have in the mail:

-3" Flowmaster D Port Merge
-Flowtech Warlock Mufflers
-3" Hedman X-Tensions
-Summit Header Buddies
-Misc hangers, etc.

The Dport merge should provide some nice low-end "h-pipe" power and some good high-end scavenging, like an X-pipe. The Header buddies/Xtensions should give me a leak-free seal and enough extra pipe to make up for any differences in fitment, as well as offer a few extra bends that I can create a pair of turndowns from. The mufflers are going to be the cool part. They function as normal "turbo" mufflers (which have a nice deep and mellow sound) and should offer a little resistance (dare I say backpressure) to push against in city driving circumstances. When I take it to the track... or add some e-cutouts... I'll be able to uncork them to have a strait shot thru the muffler for those moments when nasty loud is needed .

The Mufflers are 13" long, 10" wide, and 4.5" tall. The height would concern me but I plan on beating the crap out of the floorpans. Honestly I plan on hammering out any part of the floor that might cause me to loose clearance... that and a little time in the vice for the exhaust pipe to give it a slight oval design around frame rails. Obviously I'll flip the fuel lines, and I might even wait to get an aftermarket torque arm if it means that I can tuck it up a little higher. My goal is good ground clearance, and I plan on taking my time making sure that everything is tucked well before I start welding. I've got poly engine mounts, so I'm going to hang it as high as I can.

Here are some pictures of what I'll be ordering in the months to come:

Flowmaster D-Port Merge #15933 :



FlowTech Warlock Mufflers #50560FLT :



Summit Header Buddies #SUM-G4772 :



Hedman X-Tensions #18718 :



This will take me a few months to accumulate, but at least I ordered the merge kit. Looking at it on the shelf in the garage every morning will keep this project on my mind. I'm hoping for a unique sound, good flow for the track, with fairly mellow idle in the city. I think I'm going to run turn-outs on the muffler exit, and no pipe on the bypass exit.

So, in the distant future I'll be selling off my hooker catback, and custom pacesetter Y with 4" flowmaster merge.

Stay tuned

 

how much money in parts is that? post up pics when its installed please.

 

~$330 bucks.

The D-port Merge was $160.40 shipped from Performance Peddler ($199 plus shipping from Summit) Google Shopping + part numbers are your friend

The mufflers will be ~$123 for the pair, assuming that I can talk a store manager at Advance into getting me a 20% discount. Advance has them in their warehouse, and if you catch a store getting close to the end of their sales period you can make some deals!

The header buddies from summit are $22.95 per pair, and the extensions are $29.95 per pair.

I'll probably have about $350 in them when I'm done.

I plan on taking extensive pictures, to include the all important 12oz can clearance pics. I'll even throw in some sound clips from the hooker setup that I'm rockin, and then have a compare file for the duals. I just hope that the Fbody sound goes away when I kill the single 3" pipe going over the axle.

 

if they turn out good you should make and sell these.

 

Eh, I think it will turn out good, but I think it would be hard to market an exhaust kit which requires the purchaser to beat the crap out of their floor pans just to clear a paint-strip in the road.

I think I'll take enoug pictures to give someone a good idea of what will be involved in fabricating some duals. As long as you've got access to a welder, a chop saw, hand tools (most importantly a BFH), and a way to hold your stuff in place while you tack it together then you should be able to make your own.

I'm a beginning weldor and I'm not affraid to hammer on my ride to make some ground clearance, afterall, it's a Camaro

I'm sure my welds won't look perfect, I just want it to sound good.

 

Post up some idle clips after the install!!

 

Oh you know it! That goes without saying. Only problem is that I'll most likely spend the next few months gathering the parts

 

Subscribing for results! I was looking into building my own set as well.

 

Here's some interesting info on the Warlock Muffler:

All mufflers were dyno-tested on a 355-cube SBC with 10.0:1 compression, Air Flow Research 190 aluminum heads, a CompCams 292 hyd. a Victor Jr. intake, a Holley 750-cfm double-pumper, and 1 5/8 Headman headers.

The results in HP order:
1.Flowtech Warlock (open) 374.2 hp/ 333.1 tq
2.Bassani Real Street 373.7 hp/ 333.8 tq
3.Hooker Maxflow 373.5 hp/ 333 tq
4.Borla XS 373.3 hp/ 332.6 tq
5.Magnaflow 372.8 hp/ 332.5 tq
6.MAC 372.3 hp / 331.5 tq
7.Flowtech Afterburner 372.3 hp/ 330.1 tq
8.Hooker Aerochamber 372.1 hp/ 330.4 tq
9.Bassani 372 hp/ 333.5 tq
10.Spintech 371.6 hp/ 332.2 tq
11.Edelbrock Performer RPM 370.9 hp / 331.3 tq
12.Borla XR1 370 hp/ 334 tq
13.Flowtech Terminator 369.5 hp / 331.3 tq
14.Dynomax Ultra Flo 369.4 hp/ 333.2 tq
15.Flowmaster 369.4 hp / 331.8 tq
16.Flowtech Warlock 366.3 hp / 325.3 tq <Closed>
17.No muffs 365.2 hp / 330.1 tq

Sound Off in Quietest to Loudest (Decibels):

1.Borla XS, 80db at idle, 90db at 2,000 rpm, 110db at WOT.
2.Hooker Maxflow, 80db at idle, 90db at 2,000 rpm, 120db at WOT.
3.Magnaflow, 82db at idle, 91 at 2,000 rpm, 114db at WOT.
4.Flowmaster, 82db at idle, 93 at 2,000 rpm, 115db at WOT.
5.Flowtech Warlock, 83db at idle, 92 at 2,000 rpm, 112db at WOT. <Most likely closed>
6.Dynomax UltraFlo, 83db at idle, 94 at 2,000 rpm, 113db at WOT.
7.Borla XR1, 83db at idle, 96db at 2,000 rpm, 118db at WOT.
8.Bassani Street, 83db at idle, 96db at 2,000 rpm, 120db at WOT.
9.Edelbrock RPM, 84db at idle, 93db at 2,000 rpm, 118db at WOT.
10.Bassani Real Street, 84db at idle, 96db at 2,000 rpm, MAX. (120+db).
11.Flowtech Afterburner, 86db at idle, 94db at 2,000 rpm, 115db at WOT.
12.Flowtech Terminator, 86db at idle, 94db at 2,000 rpm, 119db at WOT.
13.Hooker Aerochamber, 87db at idle, 94db at 2,000 rpm, 114db at WOT.
14.SpinTech, 87db at idle, 97db at 2,000 rpm, 116db at WOT.
15.MAC, 87db at idle, 98db at 2,000 rpm, 119db at WOT.
16.No Muffler, 91db at idle, 103db at 2,000 rpm, MAX. (120+db).

Should be relitively quiet and drive well with the cutout closed and run like no muffler with the cutout open.

 

in to see the fabbing and beating of the floor boards.

 

This muffler is beautifull.

 

Yeah I can't find anyone who's ever run them on a set of duals under an Fbody. There are several threads going way back that ask about them, but no one has ever pulled the trigger... at least that I've seen.

As far as the floor pans are concerned, I don't see myself doing any fabbing. I'll probably be satisfied with just hammering them in so that I can hang these mufflers as high as I can. I've seen where people have cut their floor boards out and welded in a flat piece of steel before. That's the best looking setup, and they claim that their back seat is still usable as long as you don't cut it too shallow. That's a little too much work for me right now, maybe in the future. I'm thinking mine will turn out a lot like MM98's floorpans.

 

The only thing I see that might be a problem are the mufflers.. I'm running Mac flowpaths and the case size is 3.75x9x13 and I had to beat the crap out of the floor pans for them to clear.. Clearance from the muffler to the ground is fine but they are a lil close to the fuel lines.. Yours being 10" in width might be very close to the fuel lines or even the drive shaft.

 

Trust me when i tell you that you can fit these mufflers under the rear seats perfect. But not through beating. Its just not enough. You have to cut it, however its actually very simple and you retain the full function of your rear seats and belts. Post up if you have any questions. Here's my thread in case you need to see my pics.

https://ls1tech.com/forums/multimedi...pics-vids.html

 

Has anyone ever relocated the fuel lines to where the heat wouldn't become a massive threat to them?

I've thought about cutting out the pans of the seats, but I'm not really wanting to put that kind of effort into it. I remember your thread for your 4" exhaust and it turned out looking good. I'm not running any rear seats and don't plan on putting them back in. I also don't want to cut the carpet there either. So pulling out the carpet and trimming out the seat pans would be a lot of work. I ran across a thread where a member sectioned out his pans so that he could get full sized mufflers under the car and he mentioned having to put in a flexible fuel line... I think he talked about dropping the fuel tank too.

If I could come up with a better way of routing the fuel lines under the body of the car then I would rather do that... then I'd BFH the seat pans until I could mount a microwave under each seat

Thanks for the replies guys.

Hey MM98: Do you have an aftermarket torque arm? If so, how much closer were you able to tuck your pipes?

 

I've got an Edlebrock tubular ta, the pipes were fine, it's the muffler case size that gets close to the lines. Passenger side is no problem, it's the driver side that you gotta get creative with.. I've had mine on for over 3yrs now with no problems, but there isn't a lot of room between the muffler and f-lines. If I get some time I will try and get you some pics to give you an idea.

Actually, now that I think about it, the one chambers flowmasters are a 4x10 case, so you should probably be ok. Good luck with it man and I will still try to get some pics for ya.

 

I found a pic of yours flowmaster mufflers from way back, here's the thread: https://ls1tech.com/forums/generatio...-mufflers.html

Your fuel lines are routed nicely. What was involved in relocating them?

 

Mine lines are in the stock location, but those mufflers were 2.5" and the case size was 3x8x12.. So I had room to work with on those.. I'm also lowered 1" so I was trying to get my Macs as close as possible for better ground clearance. Honestly, I think you will be ok and you might get your muffler with an offset inlet to make it a lil easier.

 

Okay, I got confused looking at yours vs a picture of the under side of my car. An old picture of the bottom of my car shows the fuel lines coming around the side, where the front seat well is. I didn't realize that I was looking at two different spots! Well, in that case, I might be able to make it fit. Thanks!

The 3" mufflers come with the offset that the advertisement shows, so that should put them closer to the center.

 

I need a low-buck back door way into some electric cutouts... Screw buying a pair of cutouts. I'd love to figure out a way to make something that would either open under full throttle automatically, or come up with a cheaper way to add an electronic butterfly to it.