Re: Legality of a straight piped big rig
In the FMCSA, under exhaust systems inspection, they do not specifically state a muffler is required, but some states may be more restrictive however. I have done straight pipes on trucks, and done the annual inspections on them without mufflers. I have yet to hear of any problems through the scales here, but if there ever is a question, it had a muffler on it when I performed the inspection. BTW, If it has jakes, I would recommend keeping the muffler, you'll go deaf in the cab if you kick the jakes on in a straight piped truck, unless you have some good sound insulation in the cab, but it does sound good though [img]/ubbthreads/images/graemlins/cool.gif[/img].
Former Ford Diesel Tech
ASE Certified Parts Counterperson, Automotive, Medium, & Heavy Truck Technician
1999 F250 XLT 4x4, Red, 7.3 6spd AWA5, 3.73LS rear, CCV Mod, APC Headlamps, Autometer C2 Gauges, (Boost,Pyro,Trans), 4" Turbo-back exhaust, XM Radio, AIS, ITP Regulated return, fuel feed lines, Airdog, & 4pos. chip.
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2001 Ford Escort ZX2 - Black- 4cyl 2.0DOHC, 5spd.
1999 F350 4x4 XLT, CC/LB PSD, 6spd, Aluminum service bed, York Compressor Onboard air, CCV, Custom Intake & Exhaust, Strobes and a few other goodies
RIP Steph F. & Trista J., 4/27/07, you will be missed by many.