Kengsxr

Anybody else going to Laguna May 2-4?

boltvette

Parade lap for the Indy Car race at Fontana on Saturday 8/30, Buttonwillow on Sunday 8/31 and Laguna Seca on Labor Day 9/1.

rmackintosh

....been there....done that.....recently!

smellya

I will be out at thunder hill on the 2nd...

Dendk

Can't wait till next week to head down, looking forward to seeing the new Tudor series...going on my third year.

skxf430

How do you guys get under the 92db sound limit????

heypal

I'm taking my mom out to watch the races, mother's day gift. I know my mom's badass lol.

DarkMastyr

Bone stock base C6 exhaust. Oh and some days it's 90db now.

I've seen a stock C6Z06 with the bimode exhaust not pass without lifting, even with the valves forcefully clamped shut.

ImHuntingWabbits

My 2010 GS was fine in March with zip ties (measured 84 db at WOT), until they melted. A Z06 also played the same trick for the first session.

A fellow GS driver showed me a switch that he used to power the solenoid which forced the NPP valves shut full time. He had no issues with sound.

I haven't installed my own yet, but basically you splice the solenoid line, insert a diode before the splice and send +12v battery power via the switch.

Supercharged111

How bass ackwards from the usual trend of forcing the wide open full time. Are under car dumps effective at tricking these things?

Dirk Miller

My '08 C6 w/ NPP's got flagged between turn 5 and 6 @ 98 decimals. It was a 92 dB day. I was able to put on four 45 degree turndowns & was lucky. I passed from then on that day... the winds, barometric press. & other variables were on my side. A friend of mine who works at the track showed me how to orient the turn downs and we positioned them up in the air at a 10:00 position. However, as my friend said, he couldn't promise this would work.

Due to this unknown, I won't run there anymore.

ImHuntingWabbits

Mixed results, the Spec Miata guys tend to favor silencers over dumps. As Dirk said, there's no guarantee they will work but nearly everyone runs them or lifts.

08 LS4

I'll be at T-Hill Friday the 2nd & Laguna on Sunday spectacting at the main races.

rmackintosh

I have under car dumps before the trans with 3" exhaust all the way...no cats, X Pipe, and a 16" LoBak muffler (Basically same design as a Moroso Spiral muffler....Cherry Bomb looking case with a corkscrew in it with a 1" straight pipe down center. Loud as hell in the car....approximately 98 decibels on the track typically....