Laguna Seca and the spec exhaust

#1

Has anyone been to Laguna Seca with their spec e30 with a spec exhaust? Does it pass sound?

I’ll be there next Tuesday with my car and will find out for sure. It’d be nice to know in advance how many backup plans I should bring along with me…

#2

Just an idea, get one of those cheap bolt on turn downs at Autozone/Advance/NAPA and direct the exhaust flow downward. May make a difference.

I know a lot of the rotary mazda guys use them and they seem to help on those buzz bombs.

#3

DaveCN wrote:

[quote]Just an idea, get one of those cheap bolt on turn downs at Autozone/Advance/NAPA and direct the exhaust flow downward. May make a difference.

I know a lot of the rotary mazda guys use them and they seem to help on those buzz bombs.[/quote]
Angling the pipe down and away from the sound booth is plan B. Plan C is to waste time bolting up a stock exhaust, cat and all :slight_smile:

#4

Buy a weld on supertrapp kit. works great for when we go to limerock. the spec exhaust isnt very loud but they generally dont play games with strict db limits…

#5

more details on that please andrew? i’ll be picking up the spec exhaust from paul shortly but would like to go to lime rock.

#6

Kish -

I don’t know what Andrew has used, but I bought a SuperTrapp (p/n 449-2218, S/C Series, 2 1/4 in. Inlet/4 in. Outlet) that is a slip-on rather than weld-on. I bought it for quiet hour while running DEs, but I haven’t used it yet. I can’t speak to how well it will stay on with hose clamps or how well it knocks down the noise level, but if you want to pay shipping each way I’d be happy to loan it to you.

#7

Here is the idea:

http://www.summitracing.com/parts/SUP-444-2503/

Not sure if that is the correct pipe size however. Weld on the black piece and then just bolt up the plates when you need them. works great, Pauly can weld on that piece in like 5 minutes and then your good to go…

#8

andrew240z wrote:

Bonus! If you weld it on and leave it in place, you have the spec fart-can exhaust tip required to run Honda Challenge. :wink:

#9

it will never even come clos at Laguna!

the super trapp idea is your best bet the bent tip to bounce the sound off the ground or over to the left will not work with that LOUD exhaust

#10

97.4db with a turn down pointed 45 degrees up and away.

I never got to plan C (stock exhaust), but did spend some time lifting for the sound station, and eventually jamming some red bull cans in the tail pipe. This was effective, but the excessive back pressure wouldn’t allow the car to rev above 3-4k rpm. Supertrapp seems like the way to go.

It’d be nice if additional muffling of the exhaust was spec legal.