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just got back from donninton park from a members track day:chuckle: when i ran last year i managed two laps then i was black flaged for noise 109db,(day over
).so when i ran at the national skyline meet,i stuck the bung in the exhaust but only managed 1 lap befor being black flaged for noise again 103db (to be expected
).so when i went down to santa pod for the jap show i was talking to mark from abbey who suggested,landing me a lagged silancer pipe to fit in were the d-cat pipe was(thanks for the offer mark:bowdown1: ) but whilst down at santa pod one of the exhaust manufactures said thay would make me one as a demo f o c:chuckle: so the following monday i take my car to have the silancer fitted,were we allso notice all the packing has gone from one of the silencers so this is allso replaced,im then thinking this should now be quieter ,after going for a run it,s slightly quieter
.i know if i put the bung in it just kills the cars performance with back pressure,so i cut the reducing pipe of the bung then replaced it with a perforated pipe,stuck it in the exhaust lots quieter and the car seems to run ok,due to the perforated pipe on the bung.so imagine my thoughts when on lap 3 i get black flagged for niose and then i,m told it,s 109DB:runaway: .thay remembered my car from previous visits,and suggested i had a word with the noise control officer situated in the control tower,who turned out to be very helpfull.as we disscused the problem and my attemts to quieten the exhaust ,he said the problem with my car and high powered turboed cars is induction noise not exhaust niose ,with cars having air filters mounted out side the bonnet having the same problem,in our disscussion i mentioned the T V R running round ,but like the man said thay dont create much induction niose.SO MY QUESTION IS CAN ANYTHING BE DONE TO QUIETEN INDUCTION NOISE my r34gtr runs about 600/630max bhp with blitz nur exhust and apexe filters with nismo air flow meters :wavey: NISMOMAN (SORRY ABOUT THE LONG WINDED POST)