Exhaust size - 3" or 2.5"
Thread Starter
Launching!
Joined: Nov 2002
Posts: 261
Likes: 0
From: Freehold, NJ
Exhaust size - 3" or 2.5" I'm in the middle of planning the layout of my true dual system and have noticed a variety of different pipe sizes used.
Some are 3" from header collector all the way back.
Some are 3" into the X and 2.5" after the X.
Some are 2.5" from the header collector all the way back.
So, my question is, which is the best configuration and why?
Some are 3" from header collector all the way back.
Some are 3" into the X and 2.5" after the X.
Some are 2.5" from the header collector all the way back.
So, my question is, which is the best configuration and why?
TECH Fanatic
Joined: Jun 2002
Posts: 1,979
Likes: 3
From: Upstate NY
Re: Exhaust size - 3 How much power do you expect from the engine?
How much noise can you tolerate?
How much money do you want to spend?
IMO, if you are over 400 rwhp, 3 inch might be helpful. The problem is that many/most(?) mufflers, even some loud ones are the big restrictions in the system. Two Dynomax Ultraflow welded 3 inchers are adequate for all the power you'll probably ever make, even with nitrous.
Magnaflow makes very similar ones. Check the flow numbers from manufacturers: if they don't give flow numbers, even if they have "flow" in their names, I'd not use them.
I'd run the 3 inch pipes at least to the mufflers because the exhaust is cooling a lot, and therefore decreasing the volume of gas. For noise purposes, you coud transition gradually from 3 to 2.5 (over about 8 inches) just befor the 2.5 inch Ultraflows for a little quieter system.
My $.02
How much noise can you tolerate?
How much money do you want to spend?
IMO, if you are over 400 rwhp, 3 inch might be helpful. The problem is that many/most(?) mufflers, even some loud ones are the big restrictions in the system. Two Dynomax Ultraflow welded 3 inchers are adequate for all the power you'll probably ever make, even with nitrous.
Magnaflow makes very similar ones. Check the flow numbers from manufacturers: if they don't give flow numbers, even if they have "flow" in their names, I'd not use them.
I'd run the 3 inch pipes at least to the mufflers because the exhaust is cooling a lot, and therefore decreasing the volume of gas. For noise purposes, you coud transition gradually from 3 to 2.5 (over about 8 inches) just befor the 2.5 inch Ultraflows for a little quieter system.
My $.02
