Join Date: Nov 2008
Location: Beautiful Chester County, PA
I had the L99 in the Caprice for many years before going with an LT1. Over the years, I added just a K&N FIPK for the lt1 cars. I also added a true dual Flowmaster catback was also added to the 4.3 without any issues or tune. Not much else I wanted to do with the little engine and neither K&N or Flowmaster would say if their kits would work or cause problems on the 4.3, but both were fine and a true bolt on.
As mentioned, the 2 engines are externally identical to each other. The nice part about these mods is they are also compatible with the LT1. If you do decide to add the other side exhaust, keep in mind you will need heat shields and hangers for the other side.
'95 Caprice SS conversion - Bonny Buckets - 96 Column, Shifter and Console - 3.73 Gear and Herter tune - Z/28 Cluster - Blazer OH Console - Green/Pink bushings - Chromed Impala Wheels - Eibach Springs and Bilstein Shocks - Corvette Engine Dress - the list goes on and still more to do...it never ends.