I have a 96 caprice classic mostly stock, I have changed the rear end to an 8.5 inch with a 3.73 and Posi, all new BMR suspension in the rear with Blisten shocks and Hotchikis lowering springs. I am looking to do performance mods to the L99 to increase power and speed. I AM NOT LOOKING TO SWAP THE MOTOR. If anyone has done some work other then exhaust and rear end I would appreciate hearing about it. or have recommendations. I plan to do a TB coolant bypass this week also. looking for recommendations for any possible mods or upgrades for the L99.