I have the pop charger never gained or lost with it,but the engine breaths better and when I open the throttle up boy oh boy I grin like a cheshire cat,with the sweet sound of engine and exhaust notes,its that nice I turn the music/radio system off and when going through tunnels i open the windows,sad but true :teeth: :D
BUY yourself a code reader ,you will get one on ebay for about £10.00,you can use this to check your warning lights etc,and clear everything,I have hfc,s and i used this all the time until I got the uprev package,cheers
cheers,I just had the plenum spacer put on and tuned at dynamic tuning in EK and car is sounding sweet,I also have the millteks,hfcs and pop charger with the uprev as you know helps.