Im on a very tight budget and I don't want to spend a lot on a cat-back exhaust. I've narrowed my search down to two axle back exhausts - mazdaspeed muffler or the ractive axle exhaust. I know that a cat-back would be a much better choice to spend my money on, but I'm not ready to spend $350-750 on a cat-back that only yields 5-10 hp. Hey much props to those who have it so don't bash me on it!! Any info and suggestions would be appreciated. 