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Hp increase

Tiny
REDBEARD726
  • MEMBER
  • 2001 PONTIAC GRAND PRIX
  • 3.8L
  • V6
  • FWD
  • AUTOMATIC
  • 139,000 MILES
I was getting 621 stainless steel exhaust header kit and downpipe what kind of increase would I see
Thursday, February 25th, 2016 AT 3:51 AM

7 Replies

Tiny
HMAC300
  • MECHANIC
  • 48,601 POSTS
Not a lot if you aren' t modifying anything else. Maybe 10-15 hp
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Thursday, February 25th, 2016 AT 6:01 AM
Tiny
REDBEARD726
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  • 8 POSTS
I mean im also getting a 250$kandn intake, but with ss stainless steel 621 exhaust header kit and a 400 cell cat zzp downpipe only 15 hp?
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Thursday, February 25th, 2016 AT 6:03 AM
Tiny
REDBEARD726
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  • 8 POSTS
I mean im also getting a 250$kandn intake, but with ss stainless steel 621 exhaust header kit and a 400 cell cat zzp downpipe only 15 hp? Also how mich would I get including the intake and 3.4 pulley on my supercharger
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Thursday, February 25th, 2016 AT 6:04 AM
Tiny
HMAC300
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If you are running a stock exhaust that is why I said 15 hp. It's only a down pipe not headers. Even the K&N isn't going to give you much because your throttle body is same size. 15 hp is a lot considering you are using stock parts. You can only get so much from these additions due to components and not modifying other things. The smaller pulley may make the supercharger do more but if you don't change injectors as well as larger throttle body then it don't expect a hundred or even 50 hp boost.
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Thursday, February 25th, 2016 AT 6:33 AM
Tiny
REDBEARD726
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  • 8 POSTS
I was ordering ss stainless steel headers and 400 cell cat downpipe separately. And what did you mean by a larger throttle body, and injectors?
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Thursday, February 25th, 2016 AT 6:51 AM
Tiny
REDBEARD726
  • MEMBER
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Can you give me an estimated hp and torque its stock 240hp 280torque stock. I replaced the mufflers with 44series flowmaster, the u bend deleted with zzp straight pipe, stainless steel racing exhaust header kit, 400cellcat downpipe, 270$k and n filter, and a smaller pulley 3.4 on my supercharger. Thanks itll be greatly appreciated
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Thursday, February 25th, 2016 AT 9:02 AM
Tiny
HMAC300
  • MECHANIC
  • 48,601 POSTS
Only a dyno can give that but i'd guess 270 hp and maybe 300 torque
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Thursday, February 25th, 2016 AT 9:36 AM

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