I have a stock 93 SC auto with 80k miles...my friend has a 95 stock Z28 with 50k miles. This is a daily driver and i have to commute about 2 hours each way to school twice a month. I was thinking exhaust first. I need something good flowing w/out the highway drone. I was thinking magnaflow res. and 2 dynomax mufflers using stock manafolds and stock cats to keep cost down. Can i count on 15 hp for that mod?? (i assume cost to be around 400 dollars) ok, so that would be like 225 hp... so i add a 5% OD pully...15hp?? 60 bucks. so thats like 240 hp for 460 dollars. Then get underdrive pulleys 10hp, 180 bucks....so 250hp for 640 dollars. Then get that magnum powers to "do their thing" to my blower for 30 hp? 500 bucks. so 280 hp, 355 torque? for $1140. Do u guys think that these are the most productive mods for the like 1200 i want to spend?? does 280hp sound about right for those mods? my friends Z28 is 270hp.