Flat Y Pipe

[Thorazine Shuffle]

This is my first LS1 car, so you'll have to pardon the newbie question...

I was looking under my car today and noticed that the y pipe is almost flat. Is it supposed to be? If so, it looks extremely restrictive!!!

[onyx_rock]

yes. stock y is flattened.

[Spaz]

and yes... it is very restrictive...

[INMY01TA]

Flattened in one spot for ground clearance but doesn't hurt performance.

[3800rs]

noticed the same thing and it got me wonderin too

[96z28]

no it is not stock, you all had somebody hammer the thing!

haha like everyone here said that is stock

[AKIRA]

and yes... it is very restrictive...

Its still 2.75" inside, so how is it restrictive?

[astyles]

i just ordered the random high flow cats with thier y pipe,thier dyno sheet shows improvement.....not sure if its the cats or pipe....maybe the combo

[Thorazine Shuffle]

I'm gonna go shopping for a new Y pipe myself. The passenger side looks good, but the driver side is only 3/4 to 1 inch tall. I want to keep the car pretty much stock, but I think that thing's got to go.

Any Suggestions on brand, or should I just go down to the local shop ,and have one made???

[INMY01TA]

You won't gain any power by switching out just the Y pipe. The stock one does flow fairly efficiently. It'd be a waste of money if you ask me. I'd wait and do a header/y pipe combo.

[Hurley711]

You won't gain any power by switching out just the Y pipe. The stock one does flow fairly efficiently. It'd be a waste of money if you ask me. I'd wait and do a header/y pipe combo.

+1 I read on the tech site a report on how they checked the flattened side and it flowed just the same. IT is a waste of $$$, if you are hell bent on doing it just go to a local muffler shop and have them cut out that 1 ft section and weld a round piece in, it will be a helluva lot cheaper than a whole new Y-Pipe.

[AKIRA]

Its still 2.75" inside, so how is it restrictive?

You just answered your own question dumbass. Dont waste your money you fucking prick.

[nhraformula]

I'm gonna go shopping for a new Y pipe myself. The passenger side looks good, but the driver side is only 3/4 to 1 inch tall. I want to keep the car pretty much stock, but I think that thing's got to go.

Any Suggestions on brand, or should I just go down to the local shop ,and have one made???

save youre money, no gains from swapping the y pipe.

[va2001ss]

Its still 2.75" inside, so how is it restrictive?

Actually the Y-pipe is 2 1/4 in. not 2 3/4 in. mines off and I have measured it. The stock I-pipe is 2 3/4 in.

[Spaz]

save youre money, no gains from swapping the y pipe.

depends on what mods you have done...

[nhraformula]

depends on what mods you have done...

not really if you think about it.
minus headers, its a waste of time and money

[1 badblack transam 01]

Its still 2.75" inside, so how is it restrictive?

I probably isnt very restrictive, but going from a round header into a flat y has to cause some sort of minor restriction.

[INMY01TA]

I probably isnt very restrictive, but going from a round header into a flat y has to cause some sort of minor restriction.

Not from a stock manifold.

[Thorazine Shuffle]

So this is what they all look like?

[Hurley711]

So this is what they all look like?

Yes, and honestly, DO NOT worry about changing it UNTIL you get a new y-Pipe with headers. You are wasting $$$ that should be spent eslewhere