Just to update the track-ability of this the Harrop kit.
I went to 2 track weekends this month at my local tracks. New Jersey Motorsports Park
1 weekend on Lighting @ 90-93 degrees.
1 weekend on Thunderbolt @ 70-75 degrees.
My car is running Harrop with catless armytrix exhaust and CSF Water and DCT radiators. OEM oil cooler. 265/285 Hankook RS4 tires
25 minute sessions.
Car would throw the Oil Temp too high warning when I got clear-ish laps for 2 laps.
(My time on lighting is on avg. 1:15)
No Christmas tree lights on the dash when that warning comes up but I would do my cool down lap when it came up. The oil temp needle was very close to 300
I think I was ok early morning when temps were around low 80s but its been awhile since I've been on this track so I wasnt going for it either.
Next weekend on Thunderbolt it was a nice comfortable 70-75 degrees and the engine was happy through-out the 25 min sessions.
This is my home course so to speak and not many cars this time. I got my PB 1:31 so I was happy about that.
Oil needle was around 275 and stayed there all day.
Overall impressions I am happy with the kit.
It doesnt seem to work in 90+ weather on the track but I avoid lap hunting during summers anyway.
It does heatsoak after the first 1-2 laps but power is consistent after it reaches peak IAT which is still much faster than a catless+tune M3.
So wishes for the Harrop:
I wish part throttle was better, its not OEM like smoothness
I wish I could run E85 to get a power bump but also that would take care of the oil cooling issues in 90+ weather I think.
A clip of me on Thunderbolt. Sorry for the shaky video