How much HP increase with these mods?
#1
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How much HP increase with these mods?
Ok, if I were to put on a Bonez cat, Bonez intake, and RB catback, how much of a HP increase could I expect? Has anyone ever tested this combo? What kind of 0-60 and 1/4 mile improvement? I'm thinking around 10-12 HP...somewhat noticeable by the seat of pants...and maybe 2 or 3 tenths improvement. Sound about right? Is it worth the cost?
#2
Bongolio
Yea 10-12hp ...IMO you could have any exshuast shop weld you on a 2 1/2 in straight pipe that would flow better than a dual rb setup for 100$. But if you have the cash go for the RB its quality is pretty impressive.
#3
Clean.
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Probably double the numbers you gave, but I dunno off hand. Search on 5th and 6th ports. They're similar to VTEC. They need exhaust backpressure to open. If they stop opening you'll lose all your would-be horsepower gains. If so you'll have to buy or make something to open them at the proper rpm.
#4
Make Money.
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Originally Posted by ericgrau
Probably double the numbers you gave, but I dunno off hand. Search on 5th and 6th ports. They're similar to VTEC. They need exhaust backpressure to open. If they stop opening you'll lose all your would-be horsepower gains. If so you'll have to buy or make something to open them at the proper rpm.
But c'mon an open air-filter in the engine bay would probably lose you horsepower, and a high-flow cat and cat-back won't give you a very significant power increase... The difference will be noticable, especially if your stock cat is getting up there in miles, but there's no reason to think it'd be greater than 15hp... So yeah, as far as intake, ditch the overpriced Bonez air-filter and buy a cheapo Ebay filter and some piping to make a cold-air intake or CAI that will get air from outside the hot engine-bay.
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#11
Space Shuttle Door Gunner
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Originally Posted by ericgrau
a full RB exhaust will give you about 24HP.
Feels great. I'll be throwing it on the rollers soon. We'll see if my guess of 180whp mark is correct.
Small streetported Pineapple Racing motor (Turbo housings, 2 piece Apex seals), Pineapple Racing 6port inserts, SAFC, Cheapo Ebay filter, Full RB exhaust.
#12
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Originally Posted by ericgrau
Guy said he had 124wHP before, 150wHP after. Might have been 114 & 140. Full Racing Beat exhaust including header. Maybe he's wrong. I only searched for one user experience.
#14
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Originally Posted by -SecretSquirrel-
Thats probably about right.. I just put on a full header back RB exhaust (Junk yard find for $10 ) on my 89 GXL. Huge difference and the the *** dyno says a solid ~20whp. The fireballs are a bonus
Feels great. I'll be throwing it on the rollers soon. We'll see if my guess of 180whp mark is correct.
Small streetported Pineapple Racing motor (Turbo housings, 2 piece Apex seals), Pineapple Racing 6port inserts, SAFC, Cheapo Ebay filter, Full RB exhaust.
Feels great. I'll be throwing it on the rollers soon. We'll see if my guess of 180whp mark is correct.
Small streetported Pineapple Racing motor (Turbo housings, 2 piece Apex seals), Pineapple Racing 6port inserts, SAFC, Cheapo Ebay filter, Full RB exhaust.
#15
Space Shuttle Door Gunner
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Originally Posted by ericgrau
N/A I'm assuming? How many miles on your old cat? Any indication that it might be clogged? Etc. I'd like to get a real number for a full exhaust. Perhaps people could post their untuned wHP numbers and we can compare those to the stock wHP.
#16
The Extremist
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I have the bonez presilencer + bonez cat, and the RB catback system and I think it works just fine. It sounds very deep, although it it alot quiter than stock now. I will be ditching the bonez silencer and cat for a RB header and presilencer tho, that should add a few dB i hope
#18
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Originally Posted by Juiceh
Surprised no one asked this because the answer can change the HP increase alot, but NA OR TURBO? Your profile says Subaru Lagacy..
#19
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Well in an N/A you wont's see half as much power gain as if you had a TII unfortunately... but 15-20whp sounds like a good number. Maybe a bit more with a better power curve if you tune it
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