wat is the right size for sgti piping

[gggti]

Currently,my gti is in all ori condition,which means 1 catalytic,2 center box (first one big,second one small),then to the twin tail pipe muffler.
so i m planning to remove the catalytic(then replace by one silencer) n the 2 center box,wat diameter should i use for piping,some say 2 inch good but more fuel consumption,some say 1.75 inch good n less fuel,i really blur.N also wats the piping size is normally use in track?

If i wan to change the muffler,is the oval type better or the N-1 type better.



THANKS IN ADVANCE FOR UR PROFESSIONAL ADVICE.I M SICK OF THOSE PUBLIC ADVICE.

 

[gggti]

haloooooooooooooooo. Powerzone , r u there?
OR anyone can guide me,public advice also never mind la,as long as i hear from u guysss.

MILLION APPRECIATE OF UR VIEW.

 

[Crash]

Optimum should be 2" - 2.25".

 

[Powerzone]

Sorry guys, my apologies, been too busy to read this forum.

OK, for your standard GTi, piping should be not more than 1.8" or 46mm internal diameter, but your rear silencer needs replacement, preferably with a S-type buffle plate design (oval box).

Good luck.

P/S: Track cars may need bigger pipes if the engine has been modified, size depends on cam profile, and max. power and rpm.

 

[V8_nutter]

Currently,my gti is in all ori condition,which means 1 catalytic,2 center box (first one big,second one small),then to the twin tail pipe muffler.
so i m planning to remove the catalytic(then replace by one silencer) n the 2 center box,wat diameter should i use for piping,some say 2 inch good but more fuel consumption,some say 1.75 inch good n less fuel,i really blur.N also wats the piping size is normally use in track?

If i wan to change the muffler,is the oval type better or the N-1 type better.



THANKS IN ADVANCE FOR UR PROFESSIONAL ADVICE.I M SICK OF THOSE PUBLIC ADVICE.

Dont mess with piping la fren, just throw away the SGTI stock extractor (the design is really bad) and cat converter. Buy a Speedworks or Powerzone xtractor, and wallah guarantee free horsepower.

 

[gggti]

Halo powerzone, so nice to hear from u ,for S-type muffler,

what brand do u recoment,is hot bits one good enough.