4th gen's front subframe is totaly different, different mounting points.
Its not a matter of a totaly different style, but there are several different times. Some run inside the frame rails, some run outside. Some are tubular, some are boxed. The problem arrises with the LT's and custom Y pipe, plus a bit of rerouting the exhaust around to meet with the I piple.
Standard y pipes for LT'ed small blocks will apparently not work. Dunno why since they would exit in the same manner, and 4th gen y's wont either/
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2/20/2013: They Day the ****s Stopped
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