Hey Guys,Finally finished it.Took off the Cargraphics 200 cell cats and put Speed Techs 100 cell cats on my Cargraphics exhaust.A little fabrication but not that bad,used a 3" pipe from cat to muffler inlet junction.... Now I can swap the cats out for a straight pipes if needs be OR get a Speed Tech exhaust minus cats or sell this exhaust as a custom..lol...I also swapped a set of stock headers that I ported /ground out BUT mine where Very clean,so I really do not think it helped.I also changed to Denso plugs from the Bosch,which looked great[10,000 miles].......My butt dyno tells me that the car has better response,quicker RPMs+a little bit more power in the low and mid range......Boost stayed the same and really I can not tell if it has more top end power but it seems to rev a little bit quicker there,who knows ?? ,it may be the 2.5 piping in the Cargraphics muffler that is the restriction now???..No check engine lites,yet,still same map.....As far as sound goes,still sound great,No drone and a tiny bit louder...Idle is at same RPM speed But not rock steady like before,Very Slight up and down at same RPM increments ..Maybe the denso plugs??...I think I would have been better off if someone bought my exhaust before this and then me buying a new one instead of doing all this? But could not sell it for a fair price...Just thought I would share my info..........

 

Turbos hate back-pressure anything done to reduce it helps.

For best results on a turbo is to run cat-less, quicker spool, lower egt's etc

I do agree the 2.5 stock tips are your's are points of restrictions as they are on mine Cargraphic Race(Cat-less)

 

Hi John,

Glad to hear it worked out well! The 100 cell cats will give you that improved throttle response you're feeling and quicker spool. Good job.