hi there people . when i put my foot down in 2nd or 3rd gear the car sort of drags then a boost kicks in like something blocked as any one any ideas. when i bought the car the guy said it has an m3 downpipe just the pipe . and chipped. it has a cat back stainless steel exhaust. does anyone know how it ca be checked if it has been chipped and if it has got the downpipe.