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On a S206 I would think the standard diameter would be fine.
That may be what you think but it would not be what you thought if you had actually tried one for a number of reasons.
BTW it is not a reducer uppipe it is an increaser uppipe or as Olly Clark christened it Harvey's trick 3 bolt uppipe
i got my up pipe very happy never seen wrapping like it thought mine was pretty good but this is so neat. super fast delivery just buy new 1 tight **** lol
yup funds are limited at the mo as just forked out for a 6 speed conversion, new GGR induction kit, silicone hoses so i can custom fit the induction kit etc etc, and still got to get a map tweek soon as well. lol
im in same boat just brought sc40 ,gt spec headers with harvey up pipe, service kit,injectors oh and still need induction hose and cold air feed oh and a remap lol slowely gettin there. u?
The whole purpose of my 3 bolt trick uppipe is that it vastly improves performance in terms of earlier spool, torque across the rev range and response/willingness in comparrison to the RCM supplied uppipe. £149 plus delivery, DEI heat wrapped with five new Subaru studs. If you already have GT2 Spec 3 bolt tubular headers this is the best mod you could do for the money bar none. By virtue of the fact it is slip jointed it also means there is considerably less likelihood of splitting your headers.