i plan on running straight throw duals and H crossover, and im wonderding if i need to buy 2 mufflers one for each side, this would be the square dynomax mufflers im talking about not the built type, BTW this is a blazer with an LS1 engine not F-body, so i dont want it to be to loud

thanks

 

Heres a link to the different sizes available.

http://www.dynomax.com/documents/ultrafloweld_specs.pdf

Yeah, theyre quiet mufflers. Not much louder than stock. They have the same internals as bullets so they should flow about the same.

Heres another link for magnaflows

http://www.magnaflow.com/02product/universal/oval.htm

They are a similar design as the ultraflos.