Is this true?
Thread Starter
Drifting
Joined: Jan 2010
Posts: 1,447
Likes: 1
From: Katy TX
Is this true?
A full 3 inch system will net about 10rwhp over a 2.5inch exhaust system. EX: LG Pro LTs & X pipe (3inch system) w/B&B Bullets vs LG Streets & Xpipe (2.5inch system) w/B&B Bullets.
Melting Slicks
Joined: Sep 2006
Posts: 2,041
Likes: 4
From: Rockford Illinois
The problem with manufacturers and people saying things like this, is you have to have a certain setup and parts list to gain that amount of power.
Without these cetain parts you wont get the power level they are advertising.
Your queston depends on ones motor setup and how radical it is. If its a stock engine I doubt you will see that type of HP increase.
Racer
Joined: Oct 2007
Posts: 333
Likes: 0
From: Western Burbs of Detroit MI
You've got it half correct. Its not just about diameter, its about pressure. Take a solid roller 12.5 to 1 compression 346 motor and 1 7/8 isn't so bad of an idea. Standard h/c 346's thats another story and most benefit from the 1 3/4 diameter and only those looking for every PEAK hp available need the 1 7/8. In my case the results on the a-b comparison for my 402 speak for themselves. More cubes equal more pressure, and therefore do benefit from a larger primary. Again though, most 346's don't need a 1 7/8 but that hasn't stopped many people from running them anyways. You just lose a little bit down low in some cases but then again I'm sure there are plenty of examples of mild h/c 346 with contrary results.
