catback 2.5" or 3"?

[Holik95]

i was going to buy a mac catback in a couple weeks but dont know if i should get the 2.5 or 3 inch system. can someone help me choose? is there a power/sound difference between the two?

 

[Uncle Meat]

Unless you have plans on running a really high boost twin screw (25+psi) in the future I think you're better off with the 2.5 inch. The 3 inch is overkill unless you are passing some serious spent gas. You need to maintain a small amount of back pressure for the engine to run at peak efficiency.

U.M.

 

[Holik95]

ok i'll get the 2.5". what size tips look the best?

 

[Cobracide]

ok i'll get the 2.5". what size tips look the best?

3" tips fill out the cutouts best.

 

[Uncle Meat]

I think my Magnaflows have 3.5 in tips. They fill up the bumper cutouts quite well.

You could always go for the 3lb coffee can tips if you really want to impress the ricers. That's what I do when I go out cruising....

U.M.

 

[SVT98Snake]

I gained 2 mph consistently with the MAC 3" over the 2.5 Stinger kit I had. I also noticed a considerable seat-of-the-pants difference top end. I did lose a little down low on torque on the dyno, but it pulls harder up top.

I do have plans for a twin screw though and that is the only reason I got the 3".

But for the record, before the 3" I ran 120, now I run 121.5-122 consistently.

I like the 3.5 tips the best, but my old Borla 4" tips looked sick. If you do go 2.5 though, buy the SLP double wall tips....those are awesome. I even have a brand new unused set if you are interested.

 

[Uncle Meat]

Wow, you had a complete 2.5 inch system (X-pipe & cat-back) and then swapped it out for a 3 inch system? Both systems utilized the same mid-pipe? Catted? Uncatted?

U.M.

 

[SVT98Snake]

sorry...clarification...

2.5 o/r X pipe into a 3 cat back. Prior I had the 2.5 X into the 2.5 Borla...

 

[Uncle Meat]

sorry...clarification...

2.5 o/r X pipe into a 3 cat back. Prior I had the 2.5 X into the 2.5 Borla...

Gotcha! Just wanted to clear that up. I didn't think you were running 3 inch throughout. Hell, does anyone even make a 3 inch X?

U.M.

 

[SVT98Snake]

Gotcha! Just wanted to clear that up. I didn't think you were running 3 inch throughout. Hell, does anyone even make a 3 inch X?

U.M.

I know Flowmaster did.....I wouldn't recommend it though. Like you said....overkill for the whole kit.

 

[Cobracide]

I think my Magnaflows have 3.5 in tips. They fill up the bumper cutouts quite well.

You could always go for the 3lb coffee can tips if you really want to impress the ricers. That's what I do when I go out cruising....

U.M.

Meat - you are correct, 3.5 tips. Now I have fart can envy now! Do they sound as good as they look? Nice ricer mod. ; )