NHRA exhaust rules?
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Joined: Nov 2002
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From: Houston, Tx
NHRA exhaust rules?
I'm reviewing all the rules for upcoming events to make sure that when it comes time, everything will go smoothly. I was looking over NHRA's rules, and it states for the Sportsman FWD class:
"All exhaust must flow through functioning muffler(s); must exit behind rear tires. Any vehicle that did not come equipped with a muffler(s) from the factory permitted, provided complete, unmodified (except for header) OEM exhaust system is utilized. "
Does everyone really run a full exhaust? I'm hoping there are loophole's that I dont know about. I dont even run a full exhaust on the street, so this came up to be a little odd. What are you guys doing to comply with this rule? I was thinking if i have to, just run a straight 4" pipe to the back, going through a low-restrictive muffler.
Thanks for your input
"All exhaust must flow through functioning muffler(s); must exit behind rear tires. Any vehicle that did not come equipped with a muffler(s) from the factory permitted, provided complete, unmodified (except for header) OEM exhaust system is utilized. "
Does everyone really run a full exhaust? I'm hoping there are loophole's that I dont know about. I dont even run a full exhaust on the street, so this came up to be a little odd. What are you guys doing to comply with this rule? I was thinking if i have to, just run a straight 4" pipe to the back, going through a low-restrictive muffler.
Thanks for your input
Joined: Jan 2004
Posts: 2,330
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From: Atlanta, ga, usa
Re: NHRA exhaust rules? (CRX SiR T)
NDRA does not require an exhaust for racing, however check with the track that the event will be at for noise ordinance restrictions. No catalytic convertors required for class either. Straight out of the NDRA rulebook. 
None of the tracks we race at require mufflers.
Not sure what the deal is with the other guys and exhaust.
None of the tracks we race at require mufflers.Not sure what the deal is with the other guys and exhaust.
Honda-Tech Member
Joined: Oct 2003
Posts: 1,499
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From: Los Angeles, CA, USA
Re: NHRA exhaust rules? (sold9secteg)
In the Sport FWD class yes they do require a muffler although there are no noise limitations on the muffler used. It does have to exit behind the rear tires with some sort of a muffler.
Thread Starter
Joined: Nov 2002
Posts: 229
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From: Houston, Tx
Re: NHRA exhaust rules? (sold9secteg)
<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by sold9secteg »</TD></TR><TR><TD CLASS="quote">NDRA does not require an exhaust for racing, however check with the track that the event will be at for noise ordinance restrictions. No catalytic convertors required for class either. Straight out of the NDRA rulebook. None of the tracks we race at require mufflers.
Not sure what the deal is with the other guys and exhaust.</TD></TR></TABLE>
Ya, I was glad NDRA had no restrictions on exhaust systems. I just thought it was odd that I can go from one series w/ open downpipe, then have to install a full exhaust for the other series. Most of the races I plan on racing this season are either NDRA or NHRA, besides a few local events, so I'm trying to adapt to those two sets of rules.
None of the tracks we race at require mufflers.Not sure what the deal is with the other guys and exhaust.</TD></TR></TABLE>
Ya, I was glad NDRA had no restrictions on exhaust systems. I just thought it was odd that I can go from one series w/ open downpipe, then have to install a full exhaust for the other series. Most of the races I plan on racing this season are either NDRA or NHRA, besides a few local events, so I'm trying to adapt to those two sets of rules.
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