Is it possible to weld a muffler that has a 2.5 in. inlet to a 3 in. pipe? Do they make some type of coupler you can use to do this. I figured it should not affect the flow to much and was curious if you could get it to fit.

 

Im sure any muffler shop could do it.

 

muffler shops should have a reducer they can weld onto the 3" pipe to make it into a 2.5" My question is why would you want that?

 

I'm no Mechanical Engineer, but I do work with a few who are car junkies.

As the exhaust gases cool down, volume contracts (See PV = nRT from chemistry) and gas velocity gets slower. Thus, having 2.5" ID instead of 3" exhaust near the axle-back is not as big of a flow reducer as, say, having 3" to 2.5" close to the turbo. If anything, we're talking 1 or 2 horsepowers here. I don't think it'll be enough to notice at all.

Turbo XS even used to sell a midpipe that would bolt to their monster DP and taper for use with stock or 2.5" axle-backs.

 

there are a lot more 2.5 in mufflers available then there are 3 in. the style i like is in a 2.5 so i wanted to see if it would fit. trying to quite my custom exhaust a little bit.

 

josh, why not see if they make a silencer for your muffler. I had one on my Apexi on my neon and it quieted it down a lot and they usually dont restrict that much. Plus you have the option of taking it out should you hit the track or dyno.

 

mike, i have a silencer but it only screws in on one side so it vibrates. the other thing is i hate the way a silencer looks in my exhaust. i also just bought a high flow cat that will be going in this weekend so we will see how much of a diff. it will make. i still might buy a muffler if i can find one that looks like the stock dual tip. my neighbor is a retired welder so he will do all my exhaust work for free.

 

Sick of the noise or did you get an exhaust ticket? Mine is really quite its got a resonator or maybe muffler after the flange where the cat would be. I ll take a pic if you like, then the rear doesn't change at all.

 

Its got an MRT uppipe to the SR40, 3" downpipe no cat then MRT cat back for those of you not familiar with my car.

 

You could always buy a resonator and have it inserted into the midpipe if you want to cut down on the noise. The high-flow will cut down some also.