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.040 Over
The aircleaner is free flowing the exhaust 3 into 1 sounds good might look into that . I have retuned it eliminating the secondaries seems to go a little better. I have cut the guts out of the catalytic converter so it free flows alot better . Would the 3 into 1 really make a noticable difference?HOW bout a 3 into 1 pipe freeflowing air filters and a retune good for 165 to 175 HP