I also have the ATR exhaust and I agree that it's better to spend a little extra so you will only have to buy once. But to run fast at the track requires loosening one bolt and taking the other out completely, opening up the exhaust. It's a free mod and not really suited for the street but it's still $700 knocked off the price of modding.
Wouldn't you consider the valve springs maintenance since if they weren't worn out you wouldn't get any performance gain from replacing them? I understand it's money spent either way. It's just that if you start out with a low mileage car and only add modifications and don't have to worry about worn out stuff you can go fast really cheap.
My dad's car was mint and it went 14.0 and could've gone 13s if it wasn't 100 degrees that day for ~$200 in modifications.
Wouldn't you consider the valve springs maintenance since if they weren't worn out you wouldn't get any performance gain from replacing them? I understand it's money spent either way. It's just that if you start out with a low mileage car and only add modifications and don't have to worry about worn out stuff you can go fast really cheap.
My dad's car was mint and it went 14.0 and could've gone 13s if it wasn't 100 degrees that day for ~$200 in modifications.