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the HKS muffers bend inwards before it takes a split to the rear. On 4was cars, there is a extra motor in the center connecting the rear lower control arms. (sorry no pics but its right after the differential) on pictures the pipes looks really close to were the motor is. Just hope if anyone knows for sure cause so far i cant find any info. check this out for reference:
HKS does NOT fit a 4WAS car.... Its pretty simple actually why it would impede an exhaust because the 4WAS equipment is right above the rear exhaust pipes.... So HKS doesnt fit a 4WAS Car due to this.....
well.. acutally there is a some clearance with rear 4WAS but just difficult to tell from the pics. the motor is only about a inch wider then the cross bar on the non 4was cars.. hope someone that knows for sure can help..