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Exactly 25 horsepower. No more, no less. That is final.
i just installed a magnaflow hi flow cat 2 weeks ago on my ride i got 4 hp a gain
you will gain some but not alot. and i will tell you why, flowmaster mufflers are chambered so they dont flow very good there just loud. if you want something that flows good were you will gain power but its not to loud than go with magnaflow but if you want something loud and flows just a good if not better than flowmaster go with the flowmaster outlaw series.
Turbo codds
keep in mind flowmaster mufflers are chambered. so they wont flow nearly as good as say a magnaflow would. so you will get more HP with a magnaflow than a flowmaster unless you put a flowmaster outlaw series on. its pretty much just a street legal way of straight piping your truck it will flow way good but it will be loud cause there is no ceramic glass packing like magnafow has.
you wont gain any horsepower, you will just gain more noise
The answer depends upon the displacement of the engine, type of piping used, composition of the muffler, exhaust type, and whether the vehicle is naturally aspirated or uses forced induction.
by upgrading your engine.
3-5 horsepower
In your 5.7 the best horsepower option would be to supercharge it. They current make a supercharger for the 5.7l hemi if that's the engine you are talking about. Intake and exhaust do produce more power, but however change the overall torque bands v Horsepower bands, therefore you may loose some horsepower in some rpms and gain some in others. Therefore a turbo charger or Supercharger will be the best money spent for more horsepower!
what can be added to gain horsepower to the air intake of a 2.2L Pontiac sunfire?
How much horsepower gain from 2 super 44s flowmaster on a f 250 with an 351 windsor