Quoted from the Street Beat rules page on www.soundoff.org:
* INTERIOR MODIFICATION LIMITS: No constructed enclosure or speaker placement that may manipulate the SPL sensor may be placed forward of the "B" pillar and will be considered reason to reclassify the vehicle to the Port Wars or Super Port Wars divisions or disqualification. This decision will be at the discretion of the head judge. Factory or factory replacement front seats must be installed in the vehicle in factory locations. Must have the front bench or both front seats. No woofers larger than 8" inches may be forward of the "B" pillars.

Ok with that being stated I need to know if I used fiberglass instead of dynamat on the floorboard under the factory carpet could I still run in SB or would that disqualify the vehicle?

I might need to look this up but in my opinion it does not say anything about modifications just manipulation of the mic. In regular SPL rules this would be considered a super mod vehicle but don't think so in SB.

This is something that needs to go to rules and ethics.

I have made a request to R&E as well, have not had a response yet.

When a rule is in question, it goes back to the USACI SPL rulebook. In thus case this vehicle would be placed in SB5 or super port wars or super mod. This is considered mic manipulation.

If you applyed it to the side where the mic is, that is manipulation.

This is tough, my first response was Super Mod or the Port Classes. Then after I 2nd guessed myself thinking maybe just lining the floor in SB would be ok according to the SB rules sheet in 2009.

Now thinking back on it any modifications done forward to the B Pillar would go back to my first response, only because 1/2 way thru the year it was judged by R&E that SB would fall under the SPL rules and there would not be a SB Rules sheet by itself any longer.

STILL TOUGH ONE TO CALL!

2010 RULES are anything not mentioned in SB portion will fall back to the SPL guidelines and any changes needed or questions should be brought to R&E Committee.

Thanks for your response Jenissa. It would be good to get definite answer on this.

I THINK IT SHOULD BE LEGAL..... DONT SEE HOW ITS DIFFERENT THAN DYNOMAT

YOU KNW ON SECOND THOUGHT JUST BUY SOME DB BLUE IT GOES ON LIKE FIBERGLASS AND WILL STIFFEN UP THE CAR AS WELL

Dynamat is made to deaden and Fiberglass is made to strenthen.

Wow Rxzilla you are reaching on that aren't you. It does not state that a "supermod" as you would like to call it cannot be run in SB. Plus the question was asked strickly about streetbeat. Not what class would it be in. So STFU. If I wanted to know what class it would put it in I would have stated that not can this be done for SB.

And dynamat is made to reduce vibrations, thus strengthing the area it is applied too. So how is that any different then fiberglass? Plus fiberglass will break underpressure where as dynamat will not.

Yes however it takes multiple layers to construct an enclosure out of fiberglass. I was asking about 1 layer. Plus it is not a constructed enclosure.

that would make u a supermod...... but what if u put a girl on the passanger side with the mic the rules say unmanned not unwomen..... what now Jenissa