lethal28

Well i have the Power Extreme exhaust on my non turbo rx 7 and it is amazing. I had a friend a while back and he had the power extreme exhaust on his 88 non turbo rx 7. Well im about to buy another one to put it on my non turbo rx 7. Will this exhaust give me more performance? I know it will be louder then the turbo rx 7. When my friend had it on his 88 non turbo it was loud but it sounded awesome, almost like a ninja bike or those race bikes. Does anyone have this exhaust on there non turbo, and if you do what kind of advice do you have for me?