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04-09-2011
Hey guys first question I am putting true dual flowmaster 40 series on my 07 Grand Prix GXP do you think that is a good choice of exhaust. And second question is I am thinking about the purchasing the Doug Thorley Headers what kind of HP gain would that give and do you think this would be a good mod. Thanks anything will help
04-09-2011
Anytime you free up the exhaust you are doing a good thing.
But you should know that with the addition of headers, things will change with the powerband. Power will more at the top end now and some of the neck snapping will be gone and moved to higher rpms.
As for how much HP you will get, I am not really sure, maybe 15-20 more hp.
and them mufflers should be good.
04-09-2011
Gotta a couple friend withGXP's running Super 44 mufflers, IMO sounds great. Not sure the HP gains from headers are worth the grand they cost though
04-10-2011
Buy speed daddy headers they are good 200 bucks you can't beat em they are perfect no since in spending more. I still have to install mine soon. This thread will help you a lot: http://www.grandprixforums.net/sd-headers-44124.html
04-10-2011
speed daddies will not work at all on his car. Also I want to see this true dual exhaust.
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