Installation of the Tri-Flo "cat-back" exhaust system on the C-5 is no more difficult than removing the factory exhaust.  Since the factory rear muffler system is one piece, (and if you want to get it out in one piece) it requires that the rear of the car be elevated really high and the rear anti-sway bar be lowered for removal. It might be easier to take the car someplace with a lift rather than try to do it in your garage.  Any good muffler shop should do the removal and installation for about $50 - $75 or so.
 

• The stock exhaust is disconnected at the flanges located just behind the catalytic converters (two bolts on each pipe - don't lose the gaskets!).

• Free the muffler from the factory rubber mounts (at the rear) and it will slip out toward the rear and down (this is where it helps to elevate the car and lower the sway bar).

• Once the stock exhaust is removed, the Tri-Flo system slips back in the exact same way.   Make sure that the left and right pipes from the mufflers to the existing system are correct (the flanges are stamped "D" and "P" for driver and passenger side).  Position them accordingly, re-using the gasket  - snug the bolts, but do not tighten them just yet.

• The Tri-Flo system has a slip joint in the axle hoop making installation simple and allows for perfect adjustment.  Position the new mufflers in place by inserting the mounting hook into the factory rubber hanger.  Mate the axle hoop and muffler inlet with the supplied clamp - do not tighten yet.

• No modifications are necessary and installation can be completed in about a 1/2 hour using regular hand tools and a hoist.  No cutting or welding is necessary.  The trick is to get the car off of the suspension so that the rear-end drive components hang down allowing room to get the old exhaust system out.  On the passenger side, it is most important to have the rear sway bar lowered.

• Once all components are in place, use a straight edge along the bottom of the tips and across the front to get the tips aligned properly.

• Tighten the flanges first then the muffler clamp, making sure everything stays in alignment.

• Fire it up and listen!  It will sound really cool.  Take it for a spin and listen for rattles

• Re-torque after a few hundred miles.

OK, so if you want to make things a bit louder, try this: For a few bucks (like $50-$100) any good muffler place will do this for you.  Have them cut holes in the inlet and outlet of the muffler and weld in a "bypass".  This really makes these guys sound rowdy when stomping on the throttle, but at steady RPM there is only a slight increase in cabin noise.  I love 'em!

Care and Cleaning: Long term exposure to hot exhaust gasses will tend to turn the tips orange.  Polishing will return them to there original luster. The tip is polished stainless steel with no clear coat or other surface finish so you can't "hurt" the finish. Use a polish like Mothers wheel polish or any good polish that contains some abrasive as stainless steel is very hard.