which ypipe?
Yeah, you'll have to dump the "shitty bolts" that come with the SE-ing clamps. There's a post somewhere telling all about it. I THINK you'll need 2" / 3/8 grade 8 bolts
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The tsp stuff is leaps and bounds better fit than the speed engineering
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tsp y pipe will slip right on the speed eng headers but the y pipe needs to be set back about another inch towards the rear of the car for the bends in the y pipe to nestle on the car where they belong. Also the angle of the outlet on the tsp y pipe wll be slightly off. It can possible be worked around by manipulating how much of certain sections of the y pipe tubes slip into the female portions of the tube from side to side but its putting a bandaid on the situation. The TSP stuff is just better all around.
If you're car is lowered you gonna have about 3" ground clearance on driver side. 
i just put bmr springs on my car and i had 3 fingers of clearance between the pipe and the ground on driver side with the driver side pipe rotated as high as it will go.... in the scrap pile the speed inc pipe goes and its still sitting there
I had plenty of space when i was lowered with the speed engineering y-pipe.. over to the left is the SLP LM2 which was the lowest part of the set up, that has nothing to do with the y-pipe.