SONICBOOST

I got mine from johnbleakleyford.com

70MACH1OWNER

Hey 2005Sonicgt,
So let me make sure I understand you correctly. The Mac Prochamber with the stock cats did not make much difference in the sound of your car. But after you removed the stock cats and went offroad that is when your car really came to life? Don't let me put words in your mouth. I'm ready to do this mod, just trying to understand. Where did you buy your prochamber and how much? This is the cheapest I have found to date.
http://www.partshopper.com/shop/MAC-...6-GT-m123.html
Thanks Scott

SONICBOOST

Scott, that is it exactly "came to life" . As far as where to get it you need to be here http://macperformance.com/store/cate...ategory_ID=938. The link you showed had a picture of the direct fit prochamber to the stock cat's ( picture 1). You want the off-road version with the long off road leg's (picture 2).

1

2

70MACH1OWNER

Thanks for the quick reply. I fully understand.

SONICBOOST

Your welcome. If you do get the offroad version don't be too alarmed if it's like crazy loud when you first start up, mine was pretty loud at first but it got a little quieter after a few day's. I love it loud though. As far as loudness what are you looking for?

JGT

Here are some clips of my catted Mac Prochamber with Borla Stingers.

A lot of them are similar, but I think there are some slight differences, I figured I'd put up everything I had.

Going to be switching out the Borla with my Bassani and take more videos for a comparison.

http://media.putfile.com/GT1

http://media.putfile.com/GT2-59

http://media.putfile.com/GT3-66

http://media.putfile.com/GT4-85

http://media.putfile.com/GT5

http://media.putfile.com/GT6

http://media.putfile.com/GT-74

70MACH1OWNER

This is what I am have trouble deciding. I love the sound of my Borla's catback system with the stock cats in place. I was hoping just adding the Prochamber only with my cats would give me the sound I am looking for. I really don't want CRAZY LOUD. Also, I have a Vert and I think it is aready louder inside the car than a coupe might be. I just looking to lower the tone of the car a bit and make it a little louder at idle.
Scott

bwilder10h

Thanks for posting. I've been wondering what the mac catted prochamber would sound like with my Borlas

When you put the prochamber on, did it help with the drone? Is it louder with the hi-flow cats and prochamber?

SONICBOOST

I would say just get the direct fit prochamber to the stock cat's and see how you like that. It definently made my exhaust deeper but not that much louder, and if you want more you could alway's get high-flow cat's or go all out and take the cat's of ( that's what I love about the prochamber is that it's so versatile) . From what you've said so far as to not wanting it crazy loud getting a high-flow catted prochamber sound's like it would be perfect for you IMO

70MACH1OWNER

Just ordered the direct fit Prochamber from Mac. I truely believe this is the best option for me, at least to start with. I can always go offroad later. It is nice Mac gives you options or baby steps. It will take a week to get it from California. I will post my opinion after install.
Scott

WuTimeUT

anyone put the prochamber to SLPs? I'm thinkin that would be crazy loud.... I love my SLPs but at higher RPM's I've started to notic a zinging sound (CATs I'm guesing). I would love to go with the prochamber or some other form of OR H pipe but I'm worried about warranty issues. I already take my CAI off when I need service. What are you guys experiences at the dealers with the OR H?

SONICBOOST

That's great, it will get a little louder and deeper as time goes on, kind of like an axle-back

SONICBOOST

I had the slp's before my stingers. Here's a short vid of them with a direct fit prochamber to stock cat's.



I wonder how the slp's would sound with an off-road prochamber

70MACH1OWNER

Come on, Come on. It's in St Louis and scheduled for Friday delivery. Guess what I will be doning this weekend.
Scott

tom281

Keep us posted!

2007redgt

Did you notice any SOTP gains?

70MACH1OWNER

Hey 2005Sonic GT,
Well, I received my direct fit Mac Prochamber on Friday. But it is 35 degrees here today and spitting a rain/snow combo. I'm to old to lay on a cold garage floor any more. Can't move the next day. I think I will just take it to the local muffler shop on Monday and get it up on a lift. I'm curious if this prochamber is a pure bolt on or do I have to cut the stock H-pipe to install. It came with no instructions and I have not been under the car yet.
Scott

70MACH1OWNER

Well, I am now able to answer a few of my own questions about the Direct Fit Mac Prochamber. I had a local muffler shop install it today and here is my first impressions with less than 10 miles on it. First off... you do have to cut the stock H-pipe to install. No big deal. I am still running my stock cats with Borla Stingers. I believe it is slightly quietier with the prochamber than the stock H- pipe. But here is the biggest surprise. We all know how bad the Borla's drone at 1800 rpm. Well, it is definitely much reduced. I will let it burn in for a few weeks to see if it gets any louder. The prochamber takes out alot of the harshness of the H-pipe but I was looking for meaner and lower pitched. I got quieter and less drone. O'well I can always get rid of the stock cats with the off road pipes and light it up again. Time will tell.
Scott

tom281

Your the 2nd person that I know that has said installing the prochamber was quieter than running an H pipe....... that's kinda weird.

70MACH1OWNER

Yeah... pay your money and take your chances. I don't want to say I am unhappy with the results (YET). I will let it burn in awhile and see what happens. I wasn't expecting it to get quieter, just lower pitched and meaner sounding. Sitting here tonight with less than 10 miles on it I can say I am very happy that some of the drone is gone but... not happy it got quieter.
Scott