Currently I have a precat decat, standard cat and milltek cat back 2.5" system fitted to my GSi running regal 3.5
I am doing some tweaks to the car currently including X20XEV inlet cam and uprating FMIC pipework to larger diameter. Then back for another remap. Would I gain anything by going full 3" from turbo back on the exhaust?
If yes then should I go complete decat or sports cat? I am looknig at the scorpian turbo back 3" system with 200cell sports cat for £630 (for a VXR but will either keep the centre exit pipe or have a new one welded on.
What are peoples views?
1) Keep exhaust as it is
2) Change standard cat for either decat or sports cat?
3) Change to full 3" exhaust and sell the milltek.
4) If change to 3" exhaust decat or sports cat?
(If sell the Milltek what is it worth?)