Waiting for a answer back from G-pop....new delima...I have these exhaust manifolds made of tubes...looks like the left side one is almost the same as my cast exhaust side...well as far as the way the crossover pipe bolts up to it...Is there any reason I should replace this with the tube one ?? Also on the right side of the motor...man its tight and I have air....Is there any way I can keep the air conditioner and still run these exhaust pipes...?? Looks like I can run the up pipe to the turbo...but the down pipe...I don't think so without removing the air conditioning unit.. Has anybody ever seen a turbo with air...if so how did they run the pipes ??