Hey everyone, i am doing the 503 cam, and i found some mac headers. I also found that the lt1 loudmouth is discontinued. The Mac catback is still available for 299 shipped. They say 18 rwh, i have the flowmaster 80 series and i know its a choke point. My question is. Is anyone running the mac catback? How does it sound with a lumy cam? And is it worth the gain? Thanks

 

do you have the entire Flowmaster system or just the muffler?

I havent heard much if anything on the Mac system for fbodies but I had one on my old Mustang and it was a quality setup. Cant go wrong with them.

 

Just the 80 series mufler. Its gotta flow better than stock. But mac says 18 horse to the ground but that is probably over stock. So i gotta say mac could give me 10 over the 80 series mufler. But i want that lumpy growl without the continuos drone inside.

 

i had the MAC catback on my 95 z28. Not a bad setup at all, i cant really tell you about performance gains but with just a catback and CAI my 95 went 13.6 @ 101 consistently
I ended up swapping it out for a stainless magnaflow setup with 3" e-cutout, mainly for looks and cause i wanted to be loud

heres a quick vid of my car with the mac catback with Pacesetter LTs and ORY

http://www.youtube.com/watch?v=AonXO...ature=youtu.be

 

That and a lumpy cam would sound really good thanks. Are u using the modified corvette fuel rail covers. Looks good! I tried it once and made a wrong cut and could never get it to look right, what kind of template did u use?

 

the frcs are custom made out of aluminum sheets, i tried finding vette covers but i wasnt willing to spend the extra money on them so i just made my own instead

 

Nice wrk i may have to make some also. Thanks for the vid it gave me a better idea of what it will sound like, did that mac drone badly driving?

 

I've got a flowmaster with the stock cat back and I have a manual cutout in place of the cat. At the track I only see a 1 mph difference between the two but that was before I did a cam change this winter.
You could keep the good sounding Flowmaster and add a e-cutout after the Mac header y-pipe and get better performance than the Mac catback for less money.

 

True, i do get alot of compliments on the way the car sounds. And i like the agressive tone of the loudmouth. Sometimes i just feel like i need a change, flowmaster has been on the car 5 years. I wish they made a super 40 for our 1 in 2 out design. I hear alot of fricken mustangs with there aftermarket agressive catback and they think it just made them just so much faster wow lol bullsh@t, and they all sound the same too.

 

nope the mac didnt drone at all cruising. it was just time for me to have something different, i actually still have the mac sitting around my garage, def a well built set up