chattering

i have a lcr nd my question is why does the turbo SUMTIMES chatter i have 007 recurc valve nd forge down pipe nd neuspeed filter started doin it mre recently hope sum1 cud explain cheers

Driving the LC to work this morning I noticed a strange chatter sound coming from the airbox area. I've smoothed my airbox and usually get a nice woosh when changing gear. I still get this woosh but its followed by a metalic chatter sound :confused: I've had a quick look under the bonnet...

Heres my prob... My car is Stage 2 map, Forge 006, FMIC, stock TIP... suddenly my DV stopped working and the "lovely" chatter sound comes to my ears... i though that the vacuum might have popped out... but under the bonnet everything was OK :doh: on the road again... and here it is!!! DV...

ive just recently installed my gauges everything working ok now :) apart from T piece, with the T piece on i get a chatter when changing gears! so i thought id take it off and try with just the vacum pipe on the dump valve and that was fine just got a woosh from the DV, im sure ive got it...