Sure have, I found a heap of small fixes that needed to be done like vacuum leaks cam cover oil leaks & stuff but the big one was the 3" exhaust & JDM mufflers were not as well flowing as they needed to be, so after having issues with back pressure I had to get a full custom 3 1/2" system made up with 3 1/2 inch Hi Flow CAT, plus I had the screamer pipe extended & plumbed back into the exhaust so I don't get booked, after an oil change I took it back to Maatouks & had another run on the dyno to make sure all is OK. found out the standard CAS doesn't like anything over 6500rpm so I'm saving up for R35 coils & bracket & a cam angle sensor to go in when I go back for the E85 tune after all this COVID shite... so its still running on great 98 octane at just over 500whp so reliable everyday, very happy & the idle is much lower now & the car shakes a bit at the lights..;)