Losing back pressure is always going to make you more topend HP. You may loose some lowend torque with less backpressure, but with a 350 Im sure its not bad. When I lost the cats in my car is made a WORLD OF difference. It was the very last thing I did, and probably added 40hp.
Skyler
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-1989 Saleen Mustang #406-
TFS Heads, Edelbrock intake, E-303, 3.73's, 1 5/8 shortys, Offroad-H, 2chamber flows, 36psi FPR, 15degrees timing, 70mm tb, 73mm maf, 24lb inj, Crank pulley, MSD6A, Alum driveshaft.
On its way: Paxton Sn-89 with dyno tuning and long tubes.
Just added: B&M Ripper, Weldin Subframes, & Turn downs!
13.2@106mph
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