i have a Flowmaster Delta 40 series on my 4 cylinder and it sounds amazing
most people things its a 6 cylinder at first because of how deep it sounds.

once i get it in 4gear it really gets low and sounds good.

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1997 Ford ranger. 2.3 ltr 4 cylinder 5 speed. 10" Kicker CVT, Alpine MRP-M450, Alpine CDA 9825. Flowmaster Delta 40 series. Smoked tails and corners. Black grille. Blue LED dash and interior backlighting. Front Fog Lights. Bad ass snowtires in the back.