dr_whigham

iTrader: (49)

I just bought my first Vette. A 2004 Coupe M6, and was pretty happy to see it had a Corsa on it already.

Now... Not so much. I can't find the part # on it ANYWHERE to see which one I actually have. I went to the website though and it seems they're all 2.5". Is this right? Talk about a let-down.

I guess my question is, if I went with ARH 1 7/8" headers and 3" X, what 3" exhausts are available?

Lastly, I HATE the idea of the exhaust curving completely 180* at the bumper. Doesn't that severely impede flow? I had dumped duals on my Camaro, and loved the sound, as well as the straight through design.

What are the options out there? I liked the Magnaflow Magnapack exhaust, but even that's a crap 2.5" system.

427zm

iTrader: (9)

Yes, you could go 1 7/8" to the 3" merge, to a full 3" out back. Truthfully though, the gain is menial if any. Almost ALL exhaust systems for the C5's and C6's are 3" merge to a 2.5" all the way back. The Vette exhaust flows well as is, the gain from 3" just isn't worth it for the trade offs. Also, I'm sure you've realized already your Vette is much shorter, and if you dumped your exhaust under the car it would literally be a foot behind your seat! Not to mention, again the gain wouldn't be worth the trade off. The 180* bend is not impeding or restricting flow enough to matter.

lastcall190

iTrader: (36)

https://ls1tech.com/forums/corvette-...there-c5s.html

Might help a little.

-J

dr_whigham

iTrader: (49)

Good replies. I really didn't know if the 180 bend would kill it or what.

It does make me wonder though just how different the c5/c6 exhausts are...

So it's either B&B, SW, or XSPower for a 3". If love to go straight back and at least ditch the 180 bend. Just doesn't "seem" right to me.

And no, I wouldn't dump the exhaust, lol

99Bluz28

iTrader: (35)

Congrats on the vette!

I wouldn't worry one bit about being held back on power at least until you at +425rwhp. I'd focus on a good set of headers first, like the Pfadt Tri-Y 1-7/8" LT headers.
BTW you might be able to install a couple of short bullet and shoot the exhaust straight out instead of making that 180* bend through the transvers mufflers. Maybe like the Borla 40842S(2.5" in/out, 5" dia., 10" case) or the Dynomax #24246(2.5"in/out, 4"dia., 12" case) , its 409 stainless steel.

ls1 1990 VN

Can't you just go to an exhaust shop with what ever muffler/s you want to have on & get them to make up the pipes, 3" or whatever it is you want. It's all I've ever done with performance cars I've owned here in NZ.

Oh yea, congrats on the Vette. Pic!!!!

JakeFusion

iTrader: (7)

LG Big 3 the only 3" exhaust for the C5 that I know of. I believe Stainless Works makes it for LG. It's pretty mellow but flows well.

You aren't losing power that far back with it necking down to 2.5". If you're going for 600rwhp NA you are losing power, but even 800rwhp supercharged, you're probably ok.

But, I'd swap out the Corsas for the Borla Stingers or B&B Bullets. I just hate Corsa. Sounds like a boat. Get something with *****. Borla more mellow. B&B for rage.

dr_whigham

iTrader: (49)

If any shops here welded with anything but an arc welder, or actually had stainless rods... I went through this before around here.

dr_whigham

iTrader: (49)

I agree. The Corsa I can't even hear. Just sounds like some mellow exotic at idle. Even passing someone it's silent.

I very well may pull it and sell it for a B&B bullet set, or the Borla you mentioned.

Future down the line plans (which either happen right away, or much longer than I anticipate) are an A&A kit with whatever head-unit is recommended for the motor that's in the car at that time.

Then we get into the whole raging debate on 1 7/8 primaries on a Corvette... Even thought we've crushed and destroyed the "1 7/8 is too big for an FBody" about 2 thousand times, apparently the Vette guys still believe they don't belong on one. And that's manufacturers included.

Makes me wonder if it's the different primary length / collector location or what, and that maybe they are right. Currently torn between ARH 1 7/8 with 3 ORX, or the new Phabt tri-Y headers.

ctd

iTrader: (1)

Better move up to the C6 right now to solve the 180* issue I've done 500 rw with a 346 & LG's Pro's & LG 3" cat back & cats so I don't believe the 180* to be a problem. One could do a pressure drop test just to verify, that would be a interesting exercise doing a 2.5 to 3" just to see.

I'm currently just a tad over 600 with the stroker, full 3" & cats included. The LG Big 3 would not stay in place, the tubing is very thin. So the current rear 3" is SW's, cats & AR 1 7/8's. Again I don't see the 180* as a problem.

Pfadt products do work, I'm running the Coils & Sways, their read diff brace cleaned up entirely the rear shake. Their headers look very good & I would certainly be having a very close look.

dr_whigham

iTrader: (49)

Well that's pretty much where I'm at then. 3 choices:

ARH 1 7/8 with their 3" X and the Big3
Phabt 1 7/8, their 3"x and the big 3.
Complete 1 7/8, 3" set from LG.

Can anyone shed light on why most manufacturers say stick with 1 3/4 for the Vettes? Why is it so much different? FBodys ALWAYS do better with the bigger primaries.

JakeFusion

iTrader: (7)

Length of primaries makes a different on the Vette. The LG is 32" long. That makes a difference in midrange torque. On the F-Body, everything is like ~24" long. 1-7/8 or 1-3/4. On the Vette, the 1-7/8 are shorter.

I'd run either the ARH 1-7/8 or the LG 1-3/4 and not look back, especially with the A&A kit. The ARH kit is nicer for installing it yourself - it has ball joints vs slip joints IIRC.

dr_whigham

iTrader: (49)

I just found one from Huron Speed that I wasn't even aware of. XSPower full 3"

http://shop.huronspeedproducts.com/X...ack-XSPC53.htm

mjs1012

iTrader: (36)

Congrats on the vette Whigham.

If youre looking for loud no doubt the Borla stinger setup is what you want. IMO best sounding c5 exhaust.

JakeFusion

iTrader: (7)

XSPower... meh.

But the system looks fantastic. And it's cheaper than the LG "Big 3" but more expensive than the Borla or B&B.

C6s have a much easier time. All the Z06 exhausts are 3" and that's a direct swap onto their cars.

dr_whigham

iTrader: (49)

I'd run a Big 3 if I find it used. Borla's out as it's 2.5" and B&B are mini bullets.

XSPower looks like a great deal to me. But who knows. After the Headers and ORX go on, I very well might like the Corsa I have.

All 2.5 inches of it...

mjs1012

iTrader: (36)

Well at least you arent dealing with a ypipe any more lol.

What are the plans for the car?

WKMCD

iTrader: (2)

I run an LG Big 3. Before when I had a Z06 Ti catback and cutouts there was about a 12 RWHP difference with the cutouts open. With the Big 3, that difference is about 1.5 RWHP. I never even use the cutouts anymore. This was on my 403 build. I think the diff would be greater with the 427.

Hope that helps.

dr_whigham

iTrader: (49)

I only had a Y pipe for a short time. I switched to duals and NEVER looked back. Loved them.

Plans for now are full intake and exhaust, some good heads, intake, and a medium stick from FTI.

Future plans are an A&A kit with a YSI, and a shortblock to accommodate it. Then matching heads... It never ends

dr_whigham

iTrader: (49)

It helps. Trust me. I think the deciding factor for me will be me getting, if ever, a definitive answer on

1) 1 7/8" primaries on a Vette,
2) how tri-Y fits into the mix
3) what the insides of both mufflers look like from Big 3 and XSPower.