The hedman long tubes will not fit out of the box. not to worry, not many long tubes under $500 will fit. i ended up cutting it near the collector and rotating it to clear the bigger trans. i also had to make a notch to clear the shifter linkage. it scrapes on the big speedbumps, but its too late to return em.
Hedman Hedders 88308 - Hedman Elite Hedders - Overview - SummitRacing.com
only the drivers side needs modification. the passenger side is fine as-is
i need to also mention, that i had an older set of black-paint hedman longtubes that fit the driver side fine, but the passenger only works for C4s. if you get into a bind and want my driver side header, it will work.
if you want the easy route... just give up a few horsepower and get shortys or mid lengths.
i saw doug thorely mid-length headers at a swapmeet that looked like theyd work