I finally was able to order the Magnaflow catback. For whatever reason, i went to their site to see the dyno sheet. Its a big change from their former claim of 22hp.

How much did you pay for the kit?

I can get it for $619 and I'm so close to you!!

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05 Bleen - GTP wheels, Pirelli tires, tinted tails and reverse light bar, HID's, more to come.....
2004 WJ - Mods in progress...

I got it for $513 shipped. Where are you at?

Chicagoland

But we can drop ship all over the midwest

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05 Bleen - GTP wheels, Pirelli tires, tinted tails and reverse light bar, HID's, more to come.....
2004 WJ - Mods in progress...

I think Magnaflow dyno quotes for 08 is measured at the wheels instead of the crank. Last year I've added the exhaulst to my car and I remember them saying 22hp. The exhaulst is the same as mines , and makes a huge differance believe me. Its well worth the money.

Installed the Magnaflow cat back last night. Impressed with the quality of the kit. Very easy install. Took longer to put the car on jack stands then to swap the exhaust.

Sounds great, only "problem" is the traction control comes on more than it used too. (:

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2008 GXP Inferno hood, Magnaflow cat back, K&N CAI, Falken 452s 275/40/18 & 245/45/18, Superchips Cortex Programmer #2950
13.88@100mph (stock tires)

What kind of Magnaflows are you guys running????

There is only one kit avalible for each of the LS4 powered cars.

I'm not sure, but magnaflow only offer one for the ls4 gxp.

so yall would recomend the Magnaflow... I was run off the road and up and over a curb today and the only realy dammage i suffered was my mufflers cought the curb and well now I need a catback and new rear bumper cover. I'm hoping I can get the shop that the insurance company tells me to take it to will put in a magnaflow instead of stock for me.

Where is the best price on the cat-back?

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06 Sport Red Metallic grand Prix GXP [Magna Flow, CAI/K&N, SuperChips Cortex]
04 Black CBR 600RR [Leo Vince, PCIII, K&N]

there is no such thing as an LS3 GP GXP.

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Only a memory
Pioneer Nav/Magnaflow Catback/E-Cutout/Poly MM/CAI/160*/TBS/STB F&R/Wrapped X-Over & 3'' DP/Flip Paint/XP5243 Atl. Plugs/10.4mm Taylor Wires/SSC

256HP/341TQ
14.05 @ 100.4 2.24 60'

i think it was a typo and they ment LS4

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06 Sport Red Metallic grand Prix GXP [Magna Flow, CAI/K&N, SuperChips Cortex]
04 Black CBR 600RR [Leo Vince, PCIII, K&N]