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Like 5 hp gain? Or does it just change the sound dramatically?:winks would you guys reccommend them? Because to be honest i want an exhaust that gives me NO hp gain. YES "NO" hp gain. hahaha thanx everyone!:kooky:
 

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drbino said:
What is that loud popping sound at the end of your revving? Was that just a recording artifact?
No HP gain but they sound great. Best thing I have installed for sound gain. As far as popping sound of the exhaust, When you first start the engine the exhaust will pop on decell until the cats warm up. The sound is unburned gas in the pipes. The heated up cats burn this fuel before it can make any popping noise.
 

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Ah, cool! Thanks for the explanation.
 

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We installed SLP Loudmout. There seemed to be a little more horsepower. Great sound...sounds like a true "retro " muscle car. With this exhaust and the removal of HC, very noticeable horsepower....
 

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The thing about the SLP Loud Mouths (a.k.a. muffler delete) is they have a rougher, less refined, true race car sound.

As for the hp gains, if you look at peak hp, no.
However, if, like me, you think the 4.6L is severely lacking in the low end hp & torque department, they do pretty good. At 2400 RPM, MM&FF rated them as having 20 more hp than stock, but more importantly, 40+ ft-lbs of torque.
 
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