Club Cobra - All that damn noise -- Again!

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All that damn noise -- Again!

What is the preferred method of meeting the noise restrictions at the track events. I have seen alot of the Supertrapp ends added to the side pipes. Is that happening more often than not? I had trapps on a small block chevy and never got used to the sound. I have the old Superformance pipes and they are way noisier than a 540 inch big block Super Comp dragster with Borlas. What are your suggestions? Should I just do newer, better side pipe mufflers, Supertrapps, cones, spiral inserts? What is the latest drug on the market...What's right.
Currently ear plugs are required, just for a cruze and a road trip is brutal. Thanks

You might just want to get a new set of Superformance pipes. I have SPF #908 with a 514" stroker and it is actually quieter than a friend's 351 (except when wfo):)

There are lots of threads on this subject out there. Check them out.

Ed

Thanks for the responces, but I have already read through the endless conversation about sidepipe contruction. There are as many opinions as Cobras. I posted in this section to see what the racers are doing to meet the track requirements. Who is happy with what ?
Thanks

What are the noise restriction level you need to meet? And how is it to be measured? WFO on the front straight with aluminum grandstands and walls all around (NHIS-99), at the end of pit lane on the front straight or where ever the sound person wants to go, with wide open spaces all around (LRP-86), 3000rpm @ 50 ft? or...

The cones are good for about 1-1 1/2db, Trapps about 2 before it all goes to h**l. CCI's I have no experience with. You need a good muffler to get most of the noise out, these other pieces are for final tuning out the last couple of db.

I worked out a set-up for NHIS that passes by trial and error. 24" Lobacs, 3 1/2" vortex cones, and Trapps (actually the set-up shown in Kit Car Louden article). Got a sound meter at Radio shack (same as they use) and set up a test facility to compare differences. 99 at NHIS worked out to 92 @6500/3rd gear at 50 ft out in the farm country. I now have a base line to compare different combos for sound/performance degredation. Burns stainless makes clamps that make changing mufflers easy. good luck.

Don

This winter I bought Dynomax collector mufflers but haven't had time to install them yet. Sounds like a great idea but i don't know if they'll meet the 95 db requirement of NHRA by themselves as promised by dynomax. I intend to still use the sidepipes as well for the street.
Colin