GTA88

First let me say this is about my daily driver Chevy Caprice. It has the 305 engine with 4 barrel carb.

Just got new muffler and tailpipe, a few days later noticed the tailpipe was smaller than the one I had before. Measured it. It is 2 inches outer diameter. The old one was at least 2 1/4 inches.

Called up a different exhaust shop and they said 2 1/4 is the standard nowadays, but the 2 inch was the norm before they added the resonator. He said they put on 2 inch sometimes today, since they are cheaper, and that I should not notice the difference in performance from the 2 1/4 inch.


I THINK the car is a bit slower now, but it was having a problem before I got the new exhaust anyway. It is slow between 30 and 50 mph, accelerating. Seems to take longer to get to 50. It doesn't cough or die on me, I can give it gas but it doesn't go much faster as I press down the pedal unless I almost kick in the 4 barrels. It cruises just fine up around 60 to 80, just a little pedal keeps it sailing along.

Hate to have the ugly scene at the exhaust shop, get a new 2 and 1/4, and still be slow.

The inlet and outlet at the new muffler are both 2 inch. They expanded the inlet to fit the intermediate pipe.

Wish I could just forget about it. I have seen a couple other Caprices out there with the 2 inch pipe but most of them have the 2 1/4.

The Y pipe where it goes into the cat is only 2 1/4 inch OD.

What about it? Is a 2 inch OD tailpipe really normal for a 305 carb V8 ? What would be the symptoms of exhaust restriction ?


Thanks

Vader

Is this a SINGLE 2" exhaust, or full dual? A 2" single exhaust is too small for a V-8, even if it is only 305 inches.

GTA88

Yep. It is a single 2 inch exhaust, Vader. Can having this exhaust harm my car ? Overwork the engine ?