Gains to expect out of Mac Headers?
Thread Starter
Staging Lane
Joined: Jul 2002
Posts: 69
Likes: 0
From: MN
Gains to expect out of Mac Headers? I've got a D-1SC Procharger on my car running 9psi and I'm still using stock manifolds and Y pipe. What kind of gains should I expect if I was to add a set of Mac headers with an offroad y pipe? Thats probably the next thing on my list before the heads and cam. I also heard that can lower your boost a couple psi???
TECH Addict
Joined: Dec 2001
Posts: 2,340
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From: Fort Worth,TX
Re: Gains to expect out of Mac Headers? </font><blockquote><font size="1" face="Verdana, Helvetica, sans-serif">quote:</font><hr /><font size="2" face="Verdana, Helvetica, sans-serif">Originally posted by Justin2000Z28:
<strong>I've got a D-1SC Procharger on my car running 9psi and I'm still using stock manifolds and Y pipe. What kind of gains should I expect if I was to add a set of Mac headers with an offroad y pipe? Thats probably the next thing on my list before the heads and cam. I also heard that can lower your boost a couple psi???</strong></font><hr /></blockquote><font size="2" face="Verdana, Helvetica, sans-serif">Honestly I would say your going to pickup at least I say again at least 30hp.I am being nice here the car will wake up big time especially sense your charged.It would be well worth the money to do those mods.It was a night and day difference on my car of course I dont have a charger so you will pretty much double my gains.
<strong>I've got a D-1SC Procharger on my car running 9psi and I'm still using stock manifolds and Y pipe. What kind of gains should I expect if I was to add a set of Mac headers with an offroad y pipe? Thats probably the next thing on my list before the heads and cam. I also heard that can lower your boost a couple psi???</strong></font><hr /></blockquote><font size="2" face="Verdana, Helvetica, sans-serif">Honestly I would say your going to pickup at least I say again at least 30hp.I am being nice here the car will wake up big time especially sense your charged.It would be well worth the money to do those mods.It was a night and day difference on my car of course I dont have a charger so you will pretty much double my gains.
TECH Senior Member
Joined: Nov 2001
Posts: 10,341
Likes: 1
Re: Gains to expect out of Mac Headers? With the offroad Ypipe and provided tuning and fuel volume/octane are adequate you could gain as much as 50-60RWHP with 9#s boost. Boosted motors benefit a lot more than NA motors from exhaust mods.
Cheers,
Chris
Cheers,
Chris
Re: Gains to expect out of Mac Headers? With a blower, you'll gain a TON of power going with a set of Macs/ORP. Be sure to port out the primaries, and have a 3 inch collector welded to the y-pipe for max flow..
josh
josh
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Staging Lane
Joined: Jul 2002
Posts: 69
Likes: 0
From: MN
Re: Gains to expect out of Mac Headers? I havent had it dynod quite yet. I'm going to get it done at Car Craft in a few weeks. ATI claims with 9psi you should have 560 flywheel horsepower on a totally stock car so I better have at least that. Thanks for your replys guys.
On The Tree
Joined: Feb 2002
Posts: 153
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From: IL
Re: Gains to expect out of Mac Headers? 9lbs of boost hope your on 100 ocatane. GWP doesnt recommend that much boost without Headers to help and proper tuning. If your cars fine I should do the same been very hesistant.