Hey Folks. Don't usually write these, as I'm pretty clued up. Or at least I thought I was. But this one has stumped me! This Green GT I have. Has always ran a beaut. Always been fast enough to surprise even me. However as the temps outside have started to drop (usually id expect performance to get even better) the performance is actually falling away! The car just seems like it is down on power, id say by a good 40-50bhp. Struggles to rev through. I thought the CAT was blocked or collapsed at first, but a decat pipe has made no change. It seems now that the issue is more common and I cant remember the last time it had its performance! The Cars Spec is as follows: Fuji Power Getter Decat Pipe HKS Actuator TRD HT Leads Long Route FMIC Walbro 255lph Pump (A/C Removed) Boost is set to 0.6Bar. EFI PIPE Fitted. Boost is always pretty solid in the 1st & 2nd gears, and in the taller gears it will creep to 0.75-0.8 built never fuel cut. But regardless of the boost. Lower or Higher. No Smoke. No Loss of Fluids. No Horrid Noises. Smells Nice. (doesn't smell hot or too rich). Good Compression Test. No Fault Codes Present and the EML does work! So... Im stumped. Im going to start unplugging sensors or swapping them out soon. My only suspicion atm is the spark plugs as I haven't changed them and im not sure how the behaviour of the engine would change with temperature. Altho I removed them today (to find HKS Items in there) they looks a nice light brown colour like Id expect to see. I have some new ones coming anyways, but. Anyone have any ideas?