are you running SpinTech mufflers??
ProStreets or the Sportsman XL's?
If this in reference to me; then: Sportsman Street XL.
Clear Image Tri-Ys & Hi-Flow cats to CIA 2.5" X-Pipe & Spintech Mufflers, Mike Harris 4L60E, Vigilante 3,400 RPM Converter, MOOG FT end, Del-A-Lum bushings in new MOOG CTRL Arms, Eibach FT Springs, New Stock rears. Hotchkis Sway Bars & End Links, RAISS, Dynoshaft, CIA Driveshaft Loop, BMR Trailing Arms, Braided Brake Hoses, Taylor Spiro-Pro Wires, AutoMeter 2-5/8" Water Temp & Oil PSI Gauges, Impala Console. ATE Blue Brake Fluid. Skip White distributor. Newly Installed 20's on 1/1/2017