Hi guys Ian upgrading my twins and have found two options to stick with my twins.. Either . HKS GTRS. or. TOMEI ARMS. So the hks is only 200 bucks more than the tomei. Just wondering which is the best option in the long run. Aiming for 500 plus hp atm but if I deciede to go higher i can still stick to them. any help will be really appreciated. cheers.