2.5 Inch exhaust to small?

[WicKeD_SS]

I would like to know is 2.5 Inch exhaust would be to small for a 650 to 700 HP BBC? I have a Ridetech 4 link and want tail pipes and stainless works has a kit for my 4 link but its 2.5. Would 3 inch be that much better ?

[Ron Sutton]

Originally Posted by WicKeD_SS

I would like to know is 2.5 Inch exhaust would be to small for a 650 to 700 HP BBC? I have a Ridetech 4 link and want tail pipes and stainless works has a kit for my 4 link but its 2.5. Would 3 inch be that much better ?

2.5" is not optimum for 650 to 700 HP. If you want to pick a hp number & max rpm you care about, I'll run some quick calcs and post the diameter you should run.

[MarkM66]

Personally, if it was my only option, I'd rather sacrifice a few hp, and have it go over the axle.

[Twoblackmarks...]

What about loudness, is that any problem?

You can have 3 inch into the muffler and 2.5" out of the mufflers?
To help quiet it Down, and easier to fit in the rear too.

[Vegas69]

Originally Posted by MarkM66

Personally, if it was my only option, I'd rather sacrifice a few hp, and have it go over the axle.

Originally Posted by Twoblackmarks...

What about loudness, is that any problem?

You can have 3 inch into the muffler and 2.5" out of the mufflers?
To help quiet it Down, and easier to fit in the rear too.

Yep, If I had kept my car it would have 2.5" tail pipes after the muffler.

[Bsinclair]

I have a 3" stainless back to my mufflers also on my 68 camaro ride tech 4bar set up. With the muscle bar in place I do not have enough room to run even 2.5" over my axle. Ridetech recomends going under the rearend which im not a big fan of. The 48hr car is done this way and looks good but its also blacked out so you dont notice it from behind. I used vband connections on the entire system and welded the outlet of the muffler with one to later install tailpipes. I think if I run them under the rear I will end up ceramic coating them black so they are hidden.

[Ketzer]

Originally Posted by MarkM66

Personally, if it was my only option, I'd rather sacrifice a few hp, and have it go over the axle.

^^ This ^^

That being said... My car also BBC, 600+ hp has a really poorly done 2.5 exhaust (crimped in the bends). I hope to revamp this winter so interested to hear what everyone says...


Jeff-