Changed out slowmaster for Magnaflow
Changed out slowmaster for Magnaflow Biggest thing i have noticed is the magna is a little more subtle under accleration but it does pop a little bit not as much..and I am hoping I get that "12hp" that they claim..any comments, views opionions....
I have do have a free flowing Ypipe. Ls6 intake and cam in the works along with JBA's( yes I know)
I have do have a free flowing Ypipe. Ls6 intake and cam in the works along with JBA's( yes I know)
Joined: Jun 2004
Posts: 1,501
Likes: 7
From: Ft. Irwin, California (But Virginia is home)
You might see around 10hp.... I say this on the following. I have the Chokemaster, but also run a QTP electric cutout. At the track, the cutout open vs closed is 1mph gain, or about 10hp. Friends I know with the Magnaflow exhaust and QTP cutout run either the same or worse mph at the track with the cutout open.....so by "deduction", the Magnaflow is offering at least a 10hp gain over the Flowmaster 
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Joined: Mar 2004
Posts: 2,336
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From: Fat Chance Hotel
I swapped out the SLP D/D muffler for the Magnaflow a few weeks back. When I started the car it sounded roughly the same as it did without the muffler until it warmed up. Ahhh the shitty sound of horsepower. 
At least I can't hear the valvetrain anymore....
At least I can't hear the valvetrain anymore....
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From: Vancouver,[KITSILANO].B.C. Canada *WestCoast*
Originally Posted by Flawless02SS
I loved my Magnaflow while I had it on. I gained 18hp on the dyno when I did Magnaflow muffler and TB bypass.
...I have been thinking of changing my flow. to something else,but I really do like the sound ..... if its that much of a gain though.? 
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Originally Posted by NHRAMAN
Did you have a FLOW on b4 the Magna.??? 18 hp is a heck of alot to gain??? TB bypass does nothing on dyno... ...I have been thinking of changing my flow. to something else,but I really do like the sound ..... if its that much of a gain though.?
...I have been thinking of changing my flow. to something else,but I really do like the sound ..... if its that much of a gain though.? Magnaflow is a great choice for a catback. Great rumble, amazing at WOT, and gets 10x meaner with LTs.
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