2.5" or 3" exhaust on 72 Blazer

[raptorgta]

I'm trying to find out what would be my best option for an exhaust on my 72 4x4 blazer. Right now it has a 4" lift but I'm planning on putting an 8" on in the future. My question is can you run a 3" exhaust under it without hurting ground clearance? Or would I just be better off running a 2.5". Thanks

[k-20]

i dont think 1/2'' is going to cxause you any trouble.

[Mike C]

Unless you are going for 500+ horsepower, the 2 1/2" will be easier to run and MUCH easier on your wallet.

[raptorgta]

Thanks for the replys. I don't think I'm anywhere close to 500 HP. I think I will go with the 2.5" I am also thinking about using the dynomax bullet mufflers. I know they will be loud but I only drive the blazer a few times a month.

[Mike C]

I have the Dynomax Hemi Turbos on my JImmy. They are NOT loud and still make good power, call me old, but powerful, high-flow AND quiet is where it's at. Ands at $40 each, affordable.

[Russell]

I have 2.5" on my truck, and they are a bit too big in my opinion. I put 2.25" on my 74, and she sounded real good. The 2.5" just sounds a bit too airy, while the 2.25 had a real crisp bark. Very nice

[see ten]

I have 2.5" to the muffler and 3" from the muffler on back. It sounds pretty aggressive I think. I had already tried 2.5" tailpipes and the turndowns before I settled with this.

[raptorgta]

That is a nice truck. I hope my Blazer will look that nice when I'm done with it. Thanks for all the replys. I kind of like the idea of going 3" after the mufflers.

[Mike C]

If you are going to do 3", no gain behind the mufflers. The gases cool as they go front to rear and take up less volume past the mufflers. 3" in and 2.5" out is probably the best power/noise trade off. And usuallay fewer bends from motor to mufflers than mufflers out the back. BUT it depends on a ton of other things like total exhaust length, total air flow (horsepower), driving style, cam design, etc.


See Ten has it right, though. You should turn the pipes and run out the side. A REAL 4x4 never has big giant chrome baloneys sticking straight out the back. When you have to rock forward and backwards to get out of a big stick you end up packing the exhaust with water and mud!