my question was can i buy a full exhaust that will work for me when i get my turbo kit. i was looking into the begi kits. would i need an axle back or what is the most i can remove from the car as far as exhaust? From what I understand, Turbo exhausts are xtremely loud without a turbo because they have no backpressure. I dont want to lose torque on my stock car. so what is the best exhaust option for me that i can re-use down the road? (no pun intended)
Turbo exhausts are extremely quiet due to the turbo being a muffler itself. If I wire my wastegate open it's the most annoyingly loud exhaust. The best option is a fully done turbo back exhaust, at least 2.5" inches in diameter.
Here's my 3" turbo back exhaust with only a single 5x8x14 muffler:
notice you can still here the intake?
if you keep anything stock on the exhaust, you hurt performance. Back pressure is evil. N/A or F/I. Most turbos will make it's boost threshold so early (1000-1500rpm) that you'll never have low-end loss of power. The best thing you can do for a turbo setup is open the exhaust with good flowing pipes, high-flow cat, and a straight through muffler.
Having a smaller exhaust adds more backpressure on top of what the turbo adds. when you start making high boost and tons of HP it's harder for the exhaust to flow out. this causes extra backpressure and the turbine and engine have to literally push against the exhaust to force it out. This causes a ton of torque loss, since energy is wasted pushing the exhaust out of the chamber and not the piston downward.
i dont think i made the question clear. my car is non turboed. all stock. i want to do my exhaust before i do a turbo kit. what exhaust should i get that can be used when i get a turbo. i want an exhaust before i get a turbo kit, but i want to make sure that when i get my new manifold/downpipe that it will match up.
FWIW I'm running 3" DIY exhaust header back on a N/A 99'. I even have 3 glasspacks and a magnaflow muffler. Should make for a quiet turbo exhaust with very little backpressure, but damn it's loud for N/A. Sucks. It's seriously louder in the car than it is outside for some reason. If I wasn't so close to turboing it I'd be switching mufflers. Unless you like loud **** keep the stock exhaust on till you get ready to turbo.