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Old 02-10-2007, 03:35 PM   #1
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Default exhaust and headers and how much HP gain?

i was wondering and i am in a discussion with my ex-boyfriend on how much HP i will gain with my SLP longtube headers and a full SLP loudmouth exhaust. does anyone on here know how much of a HP increase i will get from putting this on my car. it is going on tonight if all goes well. i read that the headers will add up to 41 HP and the exhaust will add up to 25 HP. i just want to get some opinions on here, because he allways thinks he is right. he's not. his first mistake was buying a 98 cobra mustang. he doesn't know about LS1's and thinks he does. so if you guys could help me on this one i'd appriciate it.
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Old 02-10-2007, 03:39 PM   #2
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dyno before and after.e very car is different. you can puke up numbers all day lnog and gueess but a dyno will prove what you made
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Old 02-10-2007, 03:44 PM   #3
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i don't have time to dyno it before and after. it is going on tonight. i got one hell of a deal on it and couldn't pass it up. got it dirt cheap and getting it instulled for free. if i had the chance i would. i'm hoping to be in the mid 12's this year with it. i'm just trying to see what other people got with long tubes and exhaust.
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Old 02-10-2007, 04:24 PM   #4
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I've usually used the SOTP method, (Seat of the pants) feel after i do each mod. lol. I really don't have the time to drive an hour to spend almost 100 bucks for 3 pulls on a dyno that isn't even the best dyno for rear wheel drive cars because it's an all wheel drive dyno.
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Old 02-10-2007, 04:48 PM   #5
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It depends are you getting it tuned too? Just bolting it up usually any Long tube header will add 15-20 RWHP and any good catback will add 10-15 HP. So your talkin anywhere between 25-35 to the rear wheels, with a tune I would say you could hit 35-45 RWHP, but I wouldnt go by the SLP number seem REALLY high from dyno charts ive seen
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Old 02-10-2007, 06:54 PM   #6
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Default what he said

Quote:
Originally Posted by Starz T/A 17
It depends are you getting it tuned too? Just bolting it up usually any Long tube header will add 15-20 RWHP and any good catback will add 10-15 HP. So your talkin anywhere between 25-35 to the rear wheels, with a tune I would say you could hit 35-45 RWHP, but I wouldnt go by the SLP number seem REALLY high from dyno charts ive seen
what he said.are you using an ory or a catted y this makes a difference as well
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Old 02-11-2007, 12:42 AM   #7
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non catted y.
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Old 02-11-2007, 03:05 AM   #8
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I only gained 15rwhp/18rwtq from stock to FULL exhaust.

All of these pulls were on the same dyno. My car was 321/331 stock. I added longtubes, ory, and Hooker catback and it made 336/349, weak gains huh? Then I had it TUNED, which is the key, and it made 354/373. In this configuration it went 12.30s@113 on Nitto DRs. BTW, m6.
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Old 02-11-2007, 07:44 PM   #9
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you will be in the 340-350 range with a tune, maybe 360's if you are lucky- most likely not as you are going with the SLP's. You should of gone with cats as it is going to be very raspy with the loudmoth on there, and watch out for speedbumps/potholes as the SLP headers dip pretty low.
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Old 02-12-2007, 07:18 PM   #10
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Quote:
Originally Posted by black01_WS6
you will be in the 340-350 range with a tune, maybe 360's if you are lucky- most likely not as you are going with the SLP's. You should of gone with cats as it is going to be very raspy with the loudmoth on there, and watch out for speedbumps/potholes as the SLP headers dip pretty low.
i got this setup off another car. it looked great on it. didn't dip low at all. and it is also a 3 inch exhaust. i got one hell of a deal on it and couldn't pass it up. i heard it on his car befor they tore it all to hell. but it didn't dip low at all. they put it on there very well. it was a bitch to get it off.
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Old 02-13-2007, 11:59 AM   #11
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sorry to change the subject...but to do a tune after you put headers on...what does the tune do exactly to increase the amount of power...
thanks
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Old 02-13-2007, 03:32 PM   #12
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the long tubes will make you go lean, and then your pcm will compensate and dump a lot of fuel making it run rich. A tune will clean up the A/F, and there are a lot of other things that can change as well. You can pick up quite a bit from a tune even over stock, but is kind of a waste of money till you actually get some mods like longtubes. You shouldn't need a full tune for longtubes, just a basic one that most tuners have on file and should charge around 150
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Old 05-05-2007, 07:15 PM   #13
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well guys i have an update. i have my longtubes and exhaust on. it is loud and running great so far. the tune is coming up here hopefully next week.
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Old 05-05-2007, 07:19 PM   #14
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with a tune probably 30-35 rwhp
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Old 01-01-2013, 11:05 AM   #15
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any updates?
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Old 01-01-2013, 11:13 AM   #16
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Quote:
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any updates?
Last activity was May 07, so I doubt you will be getting an answer...
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Old 01-01-2013, 12:35 PM   #17
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Lol^^^ but hey I was expecting 335-340hp tops with headers and exhaust.
I ended up getting 359/370! Good ****, but I didn't dyno it stock...
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Old 01-01-2013, 01:00 PM   #18
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I know, I just figured I'd bring it back from the dead lol
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Old 01-01-2013, 01:00 PM
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