TOO NOISEY

I will do the same on my Pantera, as I did on another car I had to show a few years ago. To dampen the sound, I stuck a bit of steel-wool into the muffler, and put a perforated steelmesh behind it to retain the steelwool. Sure, you loose some power, but it sure is easily removable

Red Tera,

I do not know what your rules or laws are, but maybe do the modification as lambolp400s proposes, and then go to a different "pit" to see if there equipment is more in your favor? I know that people in California have sometimes done that. They do not like the way one person interprets the law, so rather than fight with them, go to a different city to get another ruling from another testing facility; of course without telling what they are doing.......

Later,

Mark

Thanks Guys

I will give the steel wool a go. It sounds like a great, simple but very effective method.I will definately be going to a different pit for the next inspection.Its fair to say that each area seems to interpet the rules in different ways so hopefully I will pass the next time.

Thanks once again
Paul

What mufflers are you running? That seems pretty loud.

I've been looking into 3" inlet with 2.5" dual outlet mufflers by Magnaflo, Flowmaster, etc. These should be pretty free flowing mufflers and from some of the articles I've seen they run about 100db levels (2500rpm). I'm changing from dual straight through glass packs (2.25"dia) on each side and am a bit concerned about getting too much noise especially in the interior of the car.

I just got my copy of a Popular Hot Rod and they put a 3" single inlet/3" single outlet Flowmaster with an x-section and they measured 85-87dba at 2000rpm(cruising speeds). I plan mostly street driving and occasional track days. Maybe it's the impossible dream with so little room from the header to the end of the car. Maybe Goran Malberg has figured out how to keep the noise down with that huge drum type muffler (similar to the Ford GT design). But then you have to have 180's.

Here is a solution:

http://www.wealdenengineer.co.uk/upgrades/exhaust.htm

yep...that would work. I've been visualizing how you could run the exhaust through the wheel house area into the engine compartment...put one of those drum mufflers sitting sideways above the AC condensor (that should help the AC system LOL) running both exhaust tubes into the ends on each side and then have a couple exit tubes run out the back of the car.

My car is coming back from the fabricator in a few weeks and that is one of the projects I'll be looking into.

In CA and NV, they test exhaust noise with a $28 Radio Shack sound level meter# 33-2050. The procedure is spelled out in the DOT Handbook: use 'C' scale, 'Fast' response, set 50 ft from the edge of a road (or track) pointing directly across the road @ 90 degrees so the meter does NOT shoot up the tailpipes as the vehicle goes by. Besides the CA Police, Laguna Seca, Sears/Infinion raceway, Thunderhill race track, most autocross organizations and likely other States all use the same meter, conditions and test methods. Any deviations will give radically different readings because sound level is not linear, its logarithmic on these meters.

Thanks again
Tom I wish I was able to give you information on my exhaust but I dont know the technical names of the parts fitted or their sizes. I will however have a closer look and measure the parts.It is worth noting that our cars are tested at 3000rpm which perhaps explains the high reading.I am hoping the wire wool will do the job for now.
Thanks again I will keep you posted of my next PIT visit!