GMCYA
Resident Coonass
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I ordered a Grand Rock 4" diverter valve for the ability to switch from my stacks to under bed exhaust on long trips. Sounded like a great product until I opened the box and saw what looked like to be a mangled mess built by someone with piss poor fabrication skills and no understanding of exhaust flow whatsoever. The butterflies are not round and have a 1/4" gap when supposedly closed. I returned the unit and they want to charge me a 15% restocking fee for this scrap iron. To top it all off, the woman I spoke to was unprofessional and down right rude. I will never purchase or recommend their products again. Looks like I will be in the shop this weekend building my own.



I ordered a Grand Rock 4" diverter valve for the ability to switch from my stacks to under bed exhaust on long trips. Sounded like a great product until I opened the box and saw what looked like to be a mangled mess built by someone with piss poor fabrication skills and no understanding of exhaust flow whatsoever. The butterflies are not round and have a 1/4" gap when supposedly closed. I returned the unit and they want to charge me a 15% restocking fee for this scrap iron. To top it all off, the woman I spoke to was unprofessional and down right rude. I will never purchase or recommend their products again. Looks like I will be in the shop this weekend building my own.


