Originally Posted by dwike
the spring on the flap, 156 is lighter 4.0L and smaller, 956 is a stouter spring for 4.0L and larger motors, you want the 156...
the spring on the flap, 156 is lighter 4.0L and smaller, 956 is a stouter spring for 4.0L and larger motors, you want the 156...
you 100% positive? for an NA car the 156 may be ok. i remember reading almost to much months ago looking up about these. everyone seemed to conclude the larger 956 is the better muffler (at least for turbo) so the vlave will not rattle. my buddy put a 156 on his 91 GTi and it rattled like the MoFo.