Grand Rock Co. has been building exhaust systems for over 30 years,
specializing in heavy-duty trucks. Today, Grand Rock offers their
experience and craftsmanship for diesel pick up trucks to give you that
"BIG RIG" look. XDP offers Grand Rock stack kits that give you the
choice of 4 types of chrome stacks in various diameters to choose from
so you can get the look, sound, and quality you want. Grand Rock's
Powerflow systems fit perfectly and include zinc-plated hangers as well
as AccuSeal(tm) clamps to join the pipes together.