well the idiot i bought my firebrid from cut the muffler off and put a cherrybomb on it i dont think i get any back pressure and the car feels like it has no power at all and feels like its going to stall all the time any ideas how to fix this? oh and the hill billy cut the hangers in the back and has a hose clamp holding the cherrybomb up il try and get pics any ideas on a cheap muffler i can buy and easly put on?

 

No muffler will cause such a deficit in backpressure that it would take away power... Most of the backpressure in a system is caused by the pipes in front of the muffler. Ideally you want zero backpressure and no stagnation, which means using just the right sized pipe. Anything between 2.25" and 3" would probably be fine for a stockish V8.

Two things come to the top of my head with the assumption that this car has a few miles on it... a clogged cat or a bad timing chain. The first thing you should do though is a tune up... wires, plugs, dist cap, air filter and oil change.

To answer your question about replacements...

If you want a quiet muffler, maybe look at Hooker Aerochambers or if you're looking for something loud but an actual muffler... Flowmaster 40 series. If the noise of the cherry bomb doesn't bother you, leave it because it's not the culpret of your power issue.

 

well there is no muffler and its just a cherrybomb wouldnt that mean there is not any back pressure? and my car is FI dont i need back pressure? and my engine light comes on and code 32 comes up EGR valve my friend says it is because there is not enough back pressure and its thinking the EGR valve is stuck open or closed

 

Backpressure isn't created by the muffler only, it's created by the entire exhaust system... most of which is determined at the collector of the y-pipe. If it's an EGR malfunction I say inspect the valve for being clogged or stuck open and replace or clean the valve.

 

You only have a 2.8 V6!! I think your problem is the lack of 2 cylinders IMHO.

Let me say this before I get flamed. I used to have a car with a 3100SFI FWD, which is supposed to be better than even the old 2.8 and 3.1.

That car, absolutely could not get out of its own way. Sooo slow. And everything on it was working great. My lowly LO3 is 100x faster than that 3100. So dont expect a 2.8 to be fast like a V8 camaro.

 

Well it's not gonna be slower than any of the assorted econoboxes out there. One thing is certain, he's getting a code and that should be fixed.

 

you olny gain a little more tq by having a muffler over an open exhaust, i know running headers, dual 2 1/2's and a cherry bomb on each pipe...on a 454 with no lost power


the cat is more than enough back pressure, im running all 3in with a flow 80 and no cat, 100X's better than stock

but to solve the root of the problem he needs to check out his EGR issues, its really easy to clean or replace

 

thanks for all the answers i cleaned my EGR valve the other day with carb cleaner it didnt look to dirty im going to check my vacuum lines and EGR selinoid tomorow if i have time. another question if my vacuum lines are clogged could that cause the EGR valve to not function properly?