I have Stillen headers fitted to my car and at about 15 degress of left-hand lock, I get a vibration as the bolt-head that holds the steering column universal joint onto the rack just touches the outer circumference of the RG header .. was a little off-putting until I figured out what it was. Will replace this bolt with a half-height head Grade 8 bolt, or perhaps a cap-screw in due course to avoid it ... there is not a lot of room with these headers at the point where the steering column uni-joint fits onto the rack ...
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