[HWYSTR455]

Originally Posted by OCMDGTO

Hwy, how much power is that 442 making? I have a hard time believing there is no power loss with 2.5". I picked up 2/10 with 3" headpipes and wish I went all 3". I'm also pretty sure I was told by Dynomax that the STs start losing power past 385hp.

Could do the math and estimate it, but honestly don't know exactly. More than 385hp, that's for sure. Bernard said similar builds were in the 575 range.

442 has the trumpet tips that go thru the bumper cutouts, to get everything to line up, 2.5" is pretty much the max. They do make a kit, but have heard it doesn't fit well, and the 3" trumpet tips look silly.

So, just like on the GTO, and the Lemans before, with the splitter tailpipes, you pretty much need to run 2.5" on those. I know the 461 made more than 550hp, and the 535 certainly makes more than 600hp.

On all those, loosing a little is acceptable for my needs. I know I can run 3" up to or even past the muffler, I may try that on the GTO, will see. 442 is my daughter's car, and she's fine with giving up a little.


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