Cutout Versus Headers
Cutout Versus Headers i'm in california and want to keep the car on manifolds and all of the emmissions stuff since i don't want to be caught without it. school me as if i don't know jack about this. i don't want to do h/c/intake,headers on my 00 ss because i'd rather wait till i'm at the point of having to go larger cubes. even when i do get to larger cubes, i'd still want to run manifolds and emmissions components.
so assuming that i will be a stock 00 ls1 with 300-350 hp and 550 hp tops on spray, would a cutout allow beneficial exhaust flow through manifolds and cats for a 200 shot or should i go headers, no cats, no egr, and air? or could i even go without a cutout?
so assuming that i will be a stock 00 ls1 with 300-350 hp and 550 hp tops on spray, would a cutout allow beneficial exhaust flow through manifolds and cats for a 200 shot or should i go headers, no cats, no egr, and air? or could i even go without a cutout?
My vote would be long tubes. They make them with egr, air, and should be carb. The cutout's would help just a little, but the TQ you would gain from the headers makes it worth it.
Launching!
Joined: Jan 2003
Posts: 218
Likes: 0
From: NV
Long Tube Headers give you the best gain of course, but if you want to go for a quick 15 to 17 RWHP, the cutout is a decent mod. Even in Cali they won't screw with you on emissions for having a cutout! 
I know you guys have it rough there trying to mod a car and still pass smog tests. I have attached a dyno graph from back when my '99 Z/28 was bone stock except for an electronically operated cutout.
I was able to make 4 pulls, first two are with it closed, last two I hit the switch and opened the McCord Power Plate. Just to give you proof of what kind of gain you can expect.
I know you guys have it rough there trying to mod a car and still pass smog tests. I have attached a dyno graph from back when my '99 Z/28 was bone stock except for an electronically operated cutout.
I was able to make 4 pulls, first two are with it closed, last two I hit the switch and opened the McCord Power Plate. Just to give you proof of what kind of gain you can expect.
thanks for the replies guys!
there are no LTs that are carb legal in CA and the cats get moved or if taken off is more trouble. i know plenty of people out there are doing it, but i don't want to risk getting towed. i'm not worried about the 2 year smog test but more of patrols and the surprise roadside smog tests. i don't plan on allowing law enforcement to pop the hood or rummage through the car but cops do step over people's rights to verify their hunches.
thanks for the graph ChevyGoldfinger.
been leaning towards a cutout but want to make sure a 200 shot could flow through the stock exhaust. i'm looking at spending for $200 installed for an e cutout or $650-900 for the lpp headers, y, install, and aluminum to cover the undercarriage. anyone think that there would be a restriction where longtubes would be worth the money and worrying?
there are no LTs that are carb legal in CA and the cats get moved or if taken off is more trouble. i know plenty of people out there are doing it, but i don't want to risk getting towed. i'm not worried about the 2 year smog test but more of patrols and the surprise roadside smog tests. i don't plan on allowing law enforcement to pop the hood or rummage through the car but cops do step over people's rights to verify their hunches.
thanks for the graph ChevyGoldfinger.
been leaning towards a cutout but want to make sure a 200 shot could flow through the stock exhaust. i'm looking at spending for $200 installed for an e cutout or $650-900 for the lpp headers, y, install, and aluminum to cover the undercarriage. anyone think that there would be a restriction where longtubes would be worth the money and worrying?
