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I didnt post this earlier cuzz I was diagnosing a problem with a P0420 code but it seems to have resolved itself.
Anyway though... I have a Y87 / W68 Firebird with the dual exhaust SLP muffler. (I was told its the same muffler that the formula uses). After installing a 2.5" hi-flow cat from Flowmonster (ebay), I noticed a pretty strong increase of power. Now some of this might be reclaimed power I never knew I had from a potentially clogged cat - I'm not 100% sure but I am pretty certain my car is quicker than it was stock. I'm not saying I gained like 20 - 50 HP...it's just...noticable....
Off the line I pulled out the driveway and half gas chirped the tires well into 2nd gear between 15 - 25 MPH... Not to mention it pulls noticably harder. But one thing I REALLY noticed, was an increase in top end power. It pulls between 65 - 85 SO much easier now. Still not like an LS1, but it is definitely more available up top.
Finally, the coolest thing is the sound... It sounds AWSOME. It's louder and has a throaty rumble to it and doesn't rasp out in the higher RPMS or pop / backfire while climbing down the RPMS after letting off the gas. I honestly like the way the stock SLP Mufflers sound much more than the aftermarket Mufflers.
Anyone notice an increase like this just by replacing their catalytic converter?
Anyway though... I have a Y87 / W68 Firebird with the dual exhaust SLP muffler. (I was told its the same muffler that the formula uses). After installing a 2.5" hi-flow cat from Flowmonster (ebay), I noticed a pretty strong increase of power. Now some of this might be reclaimed power I never knew I had from a potentially clogged cat - I'm not 100% sure but I am pretty certain my car is quicker than it was stock. I'm not saying I gained like 20 - 50 HP...it's just...noticable....
Off the line I pulled out the driveway and half gas chirped the tires well into 2nd gear between 15 - 25 MPH... Not to mention it pulls noticably harder. But one thing I REALLY noticed, was an increase in top end power. It pulls between 65 - 85 SO much easier now. Still not like an LS1, but it is definitely more available up top.
Finally, the coolest thing is the sound... It sounds AWSOME. It's louder and has a throaty rumble to it and doesn't rasp out in the higher RPMS or pop / backfire while climbing down the RPMS after letting off the gas. I honestly like the way the stock SLP Mufflers sound much more than the aftermarket Mufflers.
Anyone notice an increase like this just by replacing their catalytic converter?
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