Young Maro

iTrader: (5)

Ok so currently my 93z28 has 3" true duals that dump right behind the front seats. No x pipe or anything currently, just two straight 3" pipes with Spintech bullet mufflers. With a 383 stroker / CC306 cam it is so ridiculously loud it sounds like just straight manifolds lol. It sounds really good, but too loud for cruising.


So I'm thinking about having a 3" header back system made. It would be true duals, no cats, X pipe, a quieter muffler, and it would be ran out the back instead of dumped.

With 3" true duals, you can't fit the pass side pipe over the axle right? So could I get away with routing both pipes over the driver side, or what would I have to do?

Then there's the mufflers. I want the car to still sound beast like it does now, but to get rid of the drone and noise inside the car as much as possible. Should I keep the Spintech mufflers and just run the exhaust all the way back, or should I look into some new muffs? I'm considering the Dynomax Bullets right now, but not sure what will be best for my setup.

Z28Roxy

iTrader: (4)

Exhaust all the way back will quiet things down a lot, so don't worry TOO much about needing to muffle things. Muffler choice to get the right sound is important though.

Pretty much your two options are:

UNDER the axle exhaust or

http://www.bmrsuspension.com/index.c...&productid=280

You can't run both pipes over the driver's side. You MIGHT be able to run one over the driver's side.

Young Maro

iTrader: (5)

This looks like exactly what I want, and it doesn't look like he has the panhard relocation either!

Young Maro

iTrader: (5)

What if I go with 2.5" true duals... will they fit then? A lot of the exhaust guys are telling me 3" true duals is overkill for my car (around 450 hp).

Z28Roxy

iTrader: (4)

It looks like they cut the panhard brace but I can't tell.

You can do 2.5" duals over the axle without the panhard relocation or any other fabrication (other than the exhaust itself - it's what I have). You could even keep your 3" setup where it is now and just add 2.5s to it all the way back... that's better than 2.5s all the way since exhaust cools as it gets farther away from the engine and doesn't need as big of a pipe.

Young Maro

iTrader: (5)

Damn, that would be sweet (and cheap lol). Might not look the best, but sheeet.

Vicious95Z28

iTrader: (1)

You can also run dual 2.5's both over the pass side and put the mufflers in the stock location. All that really helped quiet my car inside but it's still a monster outside. I really like to direct people to this thread, this is exactly what I did but I have 3" instead of 2.5 and I used 2 3" Dynomax bullets instead of the single magnaflow. I didn't have the room with the 3" pipes. Anyway, here's the link.

https://ls1tech.com/forums/lt1-lt4-m...cs-inside.html

BTW, I used to have dual 3" Spintech Pro Streets with x-pipe dumped under the car before the axle, I know exactly how obnoxious they can be!

MasterTomos

iTrader: (15)

Yeah it definately looks like the panhard brace was cut in that setup. 3inch would be overkill, 2.5 would be more appropriate. I'm sure someone will chime in with the HP and loss ect. for each exhaust diameter setup.

Gojira94

iTrader: (4)

Have a look in my garage at the green car. I'm running 3" to the X pipe and reducing to 2.5" from there. both tubes fit above the bar on the pass. side. I have a pair of glasspacks tucked in the old single muffler's spot. BTW, to put mufflers where that guy did, you'd have to beat in the floorboards under the rear seats quite a bit unless you ran spiralflows, glasspacks, etc. on either side of the torque arm & DS.

Young Maro

iTrader: (5)

Nice setup Viscious, that system looks killer. So if I went 2.5" would I still have to route both pipes over the pass side or would a pipe fit over each side?

PM'd ya viscous

speed_demon24

iTrader: (6)

My old 3" duals ran out the back weighed 70 lbs... just something to think about.

97Z28SS

iTrader: (5)

I'm going to be running 3" true duals exactly like the pic with one pipe over each side of the axle but I'm putting my stainless Magnaflow mufflers all the way at the rear of the car instead of under the rear seat area for better ground clearance.

Wicked94Z

iTrader: (26)

that's way too serious for this thread...

The OP would be fine with 2 1/2" exhaust.

SS MPSTR

iTrader: (1)

agreed, plus tons easier to make happen.

Young Maro

iTrader: (5)

Thanks for the info guys, sounds like I'll be going with 2.5" true duals, x pipe, ran out the back and keeping the Spintech muffs. I have a feeling it will sound 100000x better.

Vicious95Z28

iTrader: (1)

The flexible brake lines are routed on the driver side. If you have a 4channel abs car then you have even less room on that side. Routing over the driver side is possible but it takes some brake line mods.

hitmanws6

iTrader: (20)

FYI you can run 3 inch duals over the passenger side if you find a good shop. But 2.5 would work for you OP

Young Maro

iTrader: (5)

Cool thanks hitman. One last question - It looks like there need to be a ton of steep bends. Can this only be done with mandrel bends? Or will just about any crush bending shop be able to pull it off?

ABA383

iTrader: (1)

It would be best to use a shop with a madrel bender...If not then you can buy bent sections of pipe thru Jegs/Summit, etc. and cut/weld the bends as necessary. And you can run dual 3" pipes over the paseenger side if you use the BMR PHB relocation brace...It frees up a bunch of room. If you go one over each side you need to watch/relocate/heat shield the lines on the driver's side. The other option is a side exit, which routes the exhaust out behind the door and I don't think it looks bad...Here's mine...In the last shot you can see the exhaust tip...The side exit also makes the gas tank removal for fuel pump issues a breeze...And there's no drone with my muffler choice and it sounds awesome.

--Alan