if you want to save weight , i suggest running the exhaust setup the way i have mine.

I used to run a Y with a bullet dumped at the rear axle and the system i have now is much lighter and nicer sounding.

 

xr1s off my collectors sound sick!!!

 

I had a dynomax bullet on my car and it didn't do what I wanted. So, I put on a borla xr-1 and it totally cleaned up the sound of my exhaust. No more cackling and popping and the rpm's around 2200 - 2800 sound great now with no rasp and no drone. I didn't lose much actual exhaust volume, but the sound is much more refined now and it sounds much nicer. An added bonus I noticed is that the exhaust sounds much deeper now with less harshness when you rev it up.

 

I didn't vote because I have only heard my dynomax 3"x12"

Sounds good to me.

 

What flowmaster muffler do you have?

If it's the 80 series single in dual out then no. It won't actually fit under the car and it flows no where near good enough for a LS1.

Rasp can be an issue, a cam swap will probably eliminate some of it though.

If you want to try it out cheap I would get a Magnaflow muffler off Ebay. One of the Ebay shops sells them for like $60 each. And try it on the Y and dump under the car. If it still drones too much you could add another identical muffler and run two in series. It should really affect flow but should reduce db and rasp.

However it looks like you are intending more track than street orientated if you plan on a cage. This means you will be wanting a body mounted torque arm (check out UMI Performance).

A custom dual exhaust built around the FITTED torque arm would be the best route. 3" tubing into a muffler per bank and dumped before the axle. It will weigh more than a Y setup but the extra potential would IMO out weight (no pun intended) this fact.

If you plan on BIG power via nitrous or some other power adder I think a 3" Y pipe will be limiting. Which means you really need to step up to a 3.5" or 4" Y pipe after the merge. You would then be forced pretty much to go with a Borla XR-1 in 3.5" core (or bigger if they do it), this will be the best way of handling exhaust flow. Again you could in theory run two mufflers in series without too much detrimental affect. The only thing is the large core Borla's are expensive as will fabbing the tubing. So I'd still go duals. Just watch for the torque arm though!!!

This is where it's really tough, if you plan a strip car then you will break your rear end. Most of the torque arms have stilghtly different fittings for the different 12 bolt axles available. You'll need to have a look and see if one works with both axle types.

 

Thanks for all the tips guys. As it stands now I will be ordering a Borla XR1 and throwing that on for a bit. Once I get the cam and heads on I'll look into a true dual setup most likely, but for now, it's not in the picture. I'll let you all know how it sounds.

 

ive got a 3 inch dual setup x pipe,no cats, into 12 inch dynomax bullets dumped back by the rear axle, it sounds nasty at idle with the cam, it does have a little drone at highway speeds, and it has a defaning scream with you get on it.

 

SVT...
If you're going for a quick fix and anticipate going with true duals sometime in the future, just order a dynomax bullet and save yourself the $100 on the xr1. The xr1 sounds good, but with very little pipe in front of either of the mufflers, both are going to be pretty loud. Ive got a buddy of mine that just did this same thing and modeled it off of what I did (but didnt run a muffler in the stock location). He had a local shop weld up a flowmaster merge collector (dual 3" into a single 4" out) and had a 4" bullet welded up behind that with a turndown right after it. Let me tell you that it sounds freakin SICK even on an old LT1. Mine has the same setup but a 3.5" e-cutout behind the bullet so I can control the volume when I want. Mine sounds a little deeper and is more 'poppy' sounding due to the 110 lsa on the cam. I'm going to try and get some vid of the car in the next few days and hopefully it will do it justice.

 

Check out these Kooks bullets:

http://lsxgto.net/showthread.php?t=478

 

You need to add another category.....Powersticks.....

John

 

dynomax all the way!!

 

A .45 is the best sounding bullet out there.

 

 

I got to say for sound sweet thunder has it in the bag.. But for price its dynomax

Sure is alot of OK people in the house

 

LM2

 

How much different does 1 bullet after the Y compare to true duals? I have the same problem with rasp of course. I'm running LT's, ORY, and a electric cut out(usually open)

 

i have a TSP catback. it has i believe a dynomax bullet and man is it the best bang for your buck xhaust

 

I absolutely love my sweet thunders, they get everyones attention (unfortunately the cops too) my system is dumped and as long as you don't have a pipe touching the floorboard and your tips turned outward it is not too loud inside the car. but when you get on it it sounds like it could wake the dead. Its Awesome!

 

Well I will be using magnaflow cats to two dynomax bullets, i hope that it will give me a very deep tone while still being loud enough that people will know its coming, and hopefully with my cam it will sound like it just wants to tear you apart at an idle

P.S. fogot to mention its going to be true duals

 

i love my sweet thunder on my lt1. sounds mean as ****! ive gotten SOOOOOOOO many compliments on it so far.

heres my exhaust setup on an ls1 .. its one of the guys on here .. i forget
http://videos.streetfire.net/search/...11292ec30d.htm