I'm about to order the 3" DP from ZZP and wondered whether I should go with the aluminized or with the stainless steel for the extra $50 bucks. Is there really any difference in terms of longevity, looks, installation or performance?

Second, how many extra horsepower am I missing out on by not getting headers?

thanks

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Mark
The Familyman's Trans-Am
Intense 3.4 MPS, Intense FWI, Intense PCM, copper NGKs TR55's, MSD wires, MSD coils, BWD ICM, MagnaFlow High Flow Cat, drilled 180 'stat, solid front mount, Monroe Max Air rear shocks, Moog rear mounts, Moog suspension bushings, cleared front corners, 190,000 miles

The stainless steel is going to last far longer than an aluminized downpipe, especially if you're up north. As far as performance goes I doubt there's any difference, if there is, it's negligible. And you're never going to see the thing once it's installed so I wouldn't worry about how it's going to look.

Also, you're not missing out on any extra power by going with a downpipe rather than headers. With your current mods headers will be of little benefit. Unless you plan to do any valve train mods (cam/rockers) then a downpipe and a PLog would be perfectly fine.

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'93 SSE "Guinevere" RIP 1993 - 2019
'01 SSEi "Chloe" Mods: Intense FWI | GenV | WBS Intercooled | 3.2 MPS | 1.9 YT Rockers | SSAC Headers | N* TB | TEP Trans | 3.29 FDR | Torsen LSD
DTM Tuned | Dual AeroForce | Solid Mounts | 255 Walbro Pump | Fuel Logs | GXP STB & Sway Bars | CSS Lowering Springs | GXP Brakes | Disabled DRL
Magnaflow Mufflers | Magnaflow Cat | GXP Seats & Trim | 35 % Tint | Cleared & Tinted Tails | repinS Retrofited Morimoto Mini H1 | 19" GT500 Wheels
'09 G8 GT "Abigail" Mods: Rotofab | LS3 Heads, Intake & Cam | Kooks LT | Solo Exhaust | Tien Springs w/ GXP Struts | Whiteline Swaybars | BMR Subframe Connectors
Achievements: Guinevere - 264k mi | 16.27 @ 84.10mph | March '11 COTM :: Chloe - 223k mi | 13.85 @ 102mph | January '09 COTM :: Abigail - 192k mi | 12.85 @ 112mph