Stainless SS Racing Manifold Header Exhaust Grand Prix GTP Regal Impala 3 8L V6 | eBay


Their back, they have been on sale for 2 weeks now.

As for the OP, just for reference, Im running custom FWI, Plog, 3' DP, and a 3.5 and I get 9 average and 11 peak.