2011 exhaust

captbill51 · Nov 10, 2010

Have you guys with new cars been under them?

I am disapointed at the looks of the stock 5.0 exhaust. It looks like cats, H-pibe, mid pipe with resinators, muffler.
The machine welding is a thing of beauty.
Why are the resinators crushed? It really reduces the inside diameter to less than 2 inches. What is up with that?

I replaced the mufflers with the Corsa parts. The rest of the system looks like junk.

No wonder there are so many after market companys creating beautiful mandrel bent systems.

94GTLaserRC · Nov 10, 2010

captbill51 said:
Have you guys with new cars been under them?

I am disapointed at the looks of the stock 5.0 exhaust. It looks like cats, H-pibe, mid pipe with resinators, muffler.
The machine welding is a thing of beauty.
Why are the resinators crushed? It really reduces the inside diameter to less than 2 inches. What is up with that?

I replaced the mufflers with the Corsa parts. The rest of the system looks like junk.

No wonder there are so many after market companys creating beautiful mandrel bent systems.

(or sound clips) Let's hear it!
RC

satinleafct · Nov 10, 2010

If they made it too nice they'd put Magnaflow and Flowmaster out of business!

strany · Nov 12, 2010

I visited Brenspeeds shop last week and saw and listened to their 2011GT with Kooks headers, kooks h pipe and a magnaflow cat back competition system and it sounds great and according to their dyno #s, adds 30 RWHP. Thats what going on mine when I can afford it.

captbill51 · Nov 14, 2010

here are the pics that RC wanted. Just figured this out.

See the dent on the right resonator. I felt around the other one and the dent is on the top.

Beautiful welding!

94GTLaserRC · Nov 14, 2010

Looks damaged to me.

captbill51 · Nov 15, 2010

Check yours RC
Im sure this is the factory setup.
I think it would be worthless to add the Corsa x-pipe and throw the exhaust into these restrictive mid-pipes.
Sure would like a nice mandrel bent piece.
I went with Corsa because of the "no Drone" feature..I enjoy GRAND TOURING... I want it perfectly quiet at two grand +/- 200 rpm. That is where I cruise on the highway. The sync features just blow me away. This by far is the nicest, most comfortable sports car I have ever driven!

GroverDill · Nov 15, 2010

Yes the resonators are "dented" from the factory, I have no idea why. However, the stock exhaust flows really well and a catback will net very little to no power increase I cant bring myself to spend $700 for sound only. Replacing the stock catted mid pipe will gain you power and sound, that is my plan.

RochesterGT · Nov 15, 2010

GroverDill said:
Yes the resonators are "dented" from the factory, I have no idea why. However, the stock exhaust flows really well and a catback will net very little to no power increase I cant bring myself to spend $700 for sound only. Replacing the stock catted mid pipe will gain you power and sound, that is my plan.

Every cat-back I've seen nets between 15 and 25 HP at the wheels. Not huge, but it's some.

GroverDill · Nov 15, 2010

RochesterGT said:
Every cat-back I've seen nets between 15 and 25 HP at the wheels. Not huge, but it's some.

I don't believe the manufacturers claims. MMFF did a catback with more tuning on a GT 500 and got 3 more HP.....

RochesterGT · Nov 15, 2010

GroverDill said:
I don't believe the manufacturers claims. MMFF did a catback with more tuning on a GT 500 and got 3 more HP.....

I'm not talking about manufacture claims.

GroverDill · Nov 15, 2010

So then where have you seen these results?

RaceRed50 · Nov 16, 2010

Catback gains are so minimal they just dont justify the cost. Only thing I think Im gonna do is an axle-back for sound......Roush, of course..

94GTLaserRC · Nov 16, 2010

RaceRed50 said:
Catback gains are so minimal they just dont justify the cost. Only thing I think Im gonna do is an axle-back for sound......Roush, of course..

From what Im reading, in terms of power gains it's some with no cats, but mainly with Long Tubes. I agree on the axlebacks for the sound. I love my Steeda's Sound!
RC

philster01 · Nov 19, 2010

I had read replacing the x pipe on back will provide the gains.

2011 exhaust

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