no lad not one bit laggy at all,there maybe 200-300 rpm earlier on full boost,nothing a clutch kick cant sortbut the 2871 dont pull out top end like the gt30,and youve so much trottle response with the gt30 as it come in so quick.ive driven alot of drift cars with both turbos and once you drive a car with a gt30 you will never go back to anything else trust me on that
the 2871 would sell in uk very quick so my advice is sell it and go GT30 i promise you will not regret it