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Running headers on 1994 Z71 in MA

Running headers on 1994 Z71 in MA

Postby 94sierraZ71 [OP] » May 08 2012, 11:27pm

First of all I live In Massachusetts and they are tough on exhaust noise levels. I'm running a flowmaster 50 series on my 5.7 powered 94 GMC Z71 with flanges welded on each end so I can easily unbolt muffler and put oem muffler back on for inspection. Fortunately, my truck no longer has to be tested for emissions. I am wondering how my louder my truck would be with headers with the oem muffler on it at inspection time. Also would it make much difference when running the flowmaster. thanks
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Re: Running headers on 1994 Z71 in MA

Postby Onlyina_Chevy » May 09 2012, 4:32am

3.67 db.
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Re: Running headers on 1994 Z71 in MA

Postby ASTE25 » May 09 2012, 6:30am

Not much louder. It will have header "ping" but it should pass fine.
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Re: Running headers on 1994 Z71 in MA

Postby tonygrd68 » May 09 2012, 6:52am

try a different inspection station some are better then others i just did a muffler swap to a 40 series and i failed other passed it with no proplem since alot of truck in mass have alter exhaust
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