The 2 into 1 pipe gives a lot more low end then the T-5 or T-6,but a lot less top end.As for MX low end is what you want to get out of the corners fast (I use to run a Dynoport 2 into 1 pipe).Another few things you should think about is advancing your timing a bit,and having the flywheel lightened.You can bump up your timing by getting a degree key,or an adjustable stator plate,or modding your stock plate (do a search to find out how).As for the flywheel PM Boonman,he does it pretty cheap,and his turn-a-round time,and customer service is next to none.You can also PM Nightrider,because he had a used Dynoport pipe for sale and he may still have it.