2 inch exhaust big enough for a 305 V8 engine ?

How big in diameter is the crossover pipe (from manifolds to catalytic)?

Doc

"Lecher9000" wrote

It shouldn't. My 302 T-Bird starts as 2" and finishes as 1 7/8".

I would think that increasing the velocity of the exhaust gasses (by slightly reducing the pipe diameter), beyond that caused by the normal expansion, would help "squirt" the exhaust cloud away from the car. And as Martha would say... "That's a good thing".

If you're worried, there should be a ricer shop nearby where you can get a nice chrome 8" diameter tip. :)

2" OD is VERY small for a single-exhaust v8, IMO. Now I'm not a believer in monster 3-inch dual exhausts being needed on anything smaller than a 426 Hemi, but 2" single is a soda straw. It could be hampering performance. 2.5" should be adequate for a smogger 305, but not 2". Remember that cross section goes up in proportion to the radius squared.

Awkward to measure it there, but looks like slightly larger than 2 inches, as in 2 and 1/8 inch OD.

Thanks for the Walker gif. It shows the tailpipe as being 2 1/4 inch, just as I thought. Also shows the in and the out on the muffler being 2 1/2 inch.

Sounds about right to me. A common mistake people make is to put monster exhaust on small displacement engines (such as the 305), which really hampers off-idle torque.

Doc