2010-2011 cat pipes interchangable?

[popeye010]

I know there was a move to 2-3/4 " pipe at one point. I have a 2011 cat back and I know its 2-3/4. Will a 2010 stock catted h pipe fit. I really want the 2-3/4 size. I know I can change the couplings if need be.

 

[Catmonkey]

I doubt it would fit, but JBA makes an off-road pipe that is 3" and necks down to 2.75" to mesh with the stock system for 11-up cars.

 

[popeye010]

Anyone else?

 

[Tob]

I know there was a move to 2-3/4 " pipe at one point. I have a 2011 cat back and I know its 2-3/4. Will a 2010 stock catted h pipe fit. I really want the 2-3/4 size.

The stock 2010 GT500 pipe is in an 'X' configuration and not that of an 'H'. For reference...

(Left to right) '07-'10 GT500 'X' pipe, '11/'12/('13 is near identical) GT500 'H' pipe, '12/'13 Boss

And yes, '07-'10 GT500 was 2-1/2" diameter while '11/'12'/'13 was (and is) 2-3/4" diameter. I wouldn't get too caught up in the diameter of the catback pipes though. Little known tidbit - the '11/'12/'13 factory catted pipes have a more restrictive inlet that their earlier counterparts.

Here's the inlet (where the exhaust manifold terminates) of a '11/'12/'13 factory pipe...

And here's the '07-'10...

They start out the same, between the manifold and the cat, except for one minor detail. Just prior to the cat, the newer systems are smaller in diameter than the old...

'11/'12/'13...

'07-'10

And while both have flats pressed into the pipes to ease bung attachment, the '11/'12/'13 pipes have a hefty kink as well...

So I wouldn't worry about any type of gain/loss with respect to diameter, post cat.