MAC LT's/MAC Hi Flow Cats/40 Flows

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10-16-2007, 02:50 AM

Novanutcase

3rd Gear Member

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Join Date: Sep 2007

Location: Los Angeles

Posts: 688

MAC LT's/MAC Hi Flow Cats/40 Flows

I'm thinking of running this setup since the treehuggers hear in California have made it impossible to run exhaust without having to change it out every two years if I want to run without cats! I've read a lot of opposing views on LT headers as far as them making the car torquier versus they're only good if you modify the internals and they hang low. Will the Hi flows rob any power that the LT's make? Any comments on these and the setup I'm thinking of doing will be greatly appreciated. It's going on a 2003 GT 4.6!

John

10-16-2007, 03:04 AM

35thAnni99GT

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Join Date: Mar 2007

Location: Where gunshots are more common than birds chirping

Posts: 504

RE: MAC LT's/MAC Hi Flow Cats/40 Flows

I now runMAC LT's, BBK catted H, and flow 40's with a Procharger. I think it sounds awesome and I just switched from a BBK offroad H.With the o/r H it sounded raspier and more like a Harley which I didn't like. I thought I wouldn't like it but now I don't think I would ever want to change back. I can have a conversation in the car, I noticed my blow off valve sound when switching gears, and it makes a nice "hum" in the low RPM's. Plus now I can listen to my music at a comfortable level instead of turning it up so I don't have to listen to exhaust all the time.

10-16-2007, 11:07 AM

Novanutcase

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Join Date: Sep 2007

Location: Los Angeles

Posts: 688

RE: MAC LT's/MAC Hi Flow Cats/40 Flows

Got a sound clip of it? I'd love to hear it! Thanks for the reply!

John

10-16-2007, 02:55 PM

rainydayracing

4th Gear Member

Join Date: Sep 2006

Location: Pa

Posts: 1,267

RE: MAC LT's/MAC Hi Flow Cats/40 Flows

You like the bbk catted h? I am in the market for a catted mid pipe, and would have gone with a mac, but they don't make them anymore

10-16-2007, 03:53 PM

Lavitz

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Join Date: Apr 2007

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RE: MAC LT's/MAC Hi Flow Cats/40 Flows

I know O/R midpipes aren't legal in CA but I thought long tubes were illegal also. Oh well, my state could care less how much my car polutes the air.

10-16-2007, 05:34 PM

bjh061487

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Join Date: Jan 2007

Location: Philly, PA

Posts: 965

RE: MAC LT's/MAC Hi Flow Cats/40 Flows

you think two years is bad in CA... try PA which requires inspection and emissions every year... that is why i am planning on getting long tubes to electric cutouts...