Calling All Header Experts!

**BrandonHall10** · 03-24-2020

I had a set of SD's on a GTP in the past. No major complaints. My only knock against them would be the toilet drain looking section in the downpipe. It would occasionally hit things on a stock ride height car. Took some finagling to make them fit and not leak, but it can be done. Lot's of good tips in the previous post. One thing not mentioned is that you will either have to dent the tunnel to make clearance for the O2 sensor or some guys move it to the crossover pipe. Can be had for under $100 now.

FOR GRAND PRIX/GTP/REGAL/IMPALA 3.8L V6 STAINLESS RACING MANIFOLD HEADER/EXHAUST | eBay

I just ordered a set of OBX/Pacesetter knockoffs from eBay for $140. I've heard these also have fitment issues but no worse than the SD's. I have a cutoff wheel and TIG welder so I'm not too concerned. I wanted to give these a try just to know and for the better downpipe profile. They look to be mild steel so they'll probably rust. I'm going to wrap them and see what happens. I live in the desert so again, not to concerned about that. They are cheap enough, if they only last a year I'll scrap them and get some SD's.

Performance Exhaust Header 97-08 Grand Prix GTP Monte Carlo SS/Regal GS 3.8L V6 | eBay

**dezldave961** · 03-24-2020

Good notes. Ya, I buried the firewall note in my last sentence with the dipstick and swaybar note (may need to flip it with most brands), oops.

Thanks for posting those ads, BTW.

The SD downpipe was copied directly from the original SLP design, which does scrape as you're about to scrape the other low points on the car. Mine ran ~75k over 10yrs before my GTP chassis rusted out from all the winters back home, so the headers sit ready in a tote for future projects.

I've only dealt with 1 set of PaceSetters. The design was promising, but non-coated mild steel was a little scary. I know the eBay stainless knock-offs had bad crossover fit issues, dunno about the black mild steel version. Good luck.

Here's some old pics of those 2 styles, including the mock-up of PaceSetters on a spare engine to weld the downpipe and avoid rear clamp issues.
(sorry for Photobucket, I need to get my stuff off there before that site gets even worse)

Torca clamps & ZZP flex (suggested for any type): LINK
SD custom downpipe "fix" (don't know source): LINK
SD (mine) w/ new flex after 5 NY/MI/MN winters: LINK
SD front after warm-up: LINK
PS mock-up: LINK
PS welded: LINK

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