Aem Cai
I've just recently got a HKS Exhuast and found that it loses bottom end torque but makes up for it on top end. The noise is great though. I would have loved it even more if it gave bottom end torque.
If you have the finances, spoon is a great exhaust. However, people like me buy DC Sports header and cat-back system. I have heard a lot of negativity about DC Sports, however, I have also heard that because they are a major business, that they don't make trash. They do test out their products.
I'm no exhaust expert. I am just repeating what I've read here about the HKS. I haven't read anything about any single reducing power. They are generally just straight pipes with a straight through muffler. The duals are the questionable ones.


