flowmaster to true duals

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Jan 15, 2008 | 11:00 AM

neals98

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From: mississippi

flowmaster to true duals

How much power will i gain for flowmaster to true duals on a 98 Z-28 has cam and bolt ons..

Jan 15, 2008 | 11:47 AM

plaf713

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From: schenectady, ny

flowmaster as in you have the 80 series right now? if so you could gain a lot from goin true duals, they say that the 80 series is around or less flowing than the stock muffler, id say you could see up to 30hp gains.

Jan 15, 2008 | 03:48 PM

99mongooSS

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From: Denton, Tx

yeah flowmasters suck! the 40 series is the only good muffler they have besides a race muffler.

Jan 16, 2008 | 06:32 AM

teke184

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From: Key West, Florida

realistically...probably about 15hp

should make for a nice setup

Jan 16, 2008 | 06:35 AM

RareBreed0295

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From: Bishopville, SC

Quote:

Originally Posted by 99mongooSS

yeah flowmasters suck! the 40 series is the only good muffler they have besides a race muffler.

Dont forget single chambers

Jan 16, 2008 | 10:15 AM

plaf713

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From: schenectady, ny

in theory, people lose about 15hp with an 80 series setup compared to other aftermarket setups, if you had a better flowing setup you would be 15hp up, then about another 15 hp for going to true duals, just a theory, it would be like going from your stock system to true duals.

Jan 16, 2008 | 10:26 AM

Empatho

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sorry to hijack but is there any way to tell if I have an 80 or 40 series flowmaster?

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Jan 16, 2008 | 10:48 AM

SladeX

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Just going to headers + true duals netted me a gain of 43HP and 34 ft/lb of torque. Keep in mind I have cats on the car, magnaflow 3 inch, and a 3 inch custom muffler for each pipe. Gains are at the wheels.

numbers are from the same dyno, SAE corrected, first time was 325ft/lb 306HP second time was 359ft/lb 349HP.