Exhaust Diameter Question...CatBack...

[Gearhead-FMC]

Well, once again the Cat-Back System. :bash:

Just wondering if the old rule holds true that large diameter exhaust will provide the best HP numbers and smaller diameter exhaust will provide the best torque numbers. Does a SC motor negate the outcome of that old rule?

Related to MAC Cat-Back.....2.5" or 3".....is there a compelling reason to select one over the other?

TIA :beer:

 

[HISSMAN]

I wouldn't worry about the 3" exhaust until you are well over 500hp.

 

[Slow04Cobra]

go 2.5 inch it's cheaper, sounds the same, and as HISSMAN said 3 inch isn't needed until well over 5.

Slow

 

[mblgjr]

2.5" is sufficient for 600hp on pump gas.

The stock cam timing doesn't seem to favor ultra free flowing exhaust, so I wouldn't bother with the 3".

 

[Gearhead-FMC]

So...if I plan to Whipple@17# the ride in 6 mos, consider the 3"....


Know of any GOOD sound clips of the MAC?

Now, I have the SLP I....starting to sound a little high-pitched at upper RPM to me so I am considering the change. Seems like I heard the MAC sometime back and it sounded good. I am not interested in the high-tech, SS glasspacks of the Borla/Magna/SLP..... so looking to the deep-toned alternate :beer:

THKS :beer:

 

[mblgjr]

You could consider the 3", but with the Whipple, you will have no trouble with the SLP 2.5". If you want to add that "chambered" sound to it, add a Mac Pro-Chamber midpipe.

It will sound somewhat similar to the Borla Stingers with a ProChamber. Which to me, is very deep.

 

[SSKillr]

I just ordered the mac 3" cat back. I plan on adding a 2.80" upper, predator tune, cold air intake, idlers, mid pipe. Think I will be fine with this set up or will I lose any performance #'s? Thanks!

 

[SSKillr]

Anybody?

 

[SSKillr]

Will the 3" cat back be fine for under 500 hp...or will it hurt my performance #'s?

 

[HISSMAN]

Down low it may hurt a little bit, but I have to give you one of these :shrug:, because I have no first hand experience.

 

[SSKillr]

I guess I'll put the cat back on anyways this week and see how it goes. Thanks!