502 MPI Mag/GIL Exhaust
 

Has anyone added Gill to a 502 MPI MAG?

Would this make the motor run to lean?

I've got 502mpi's with CMI headers and as far as I know, the ecm's are stock. I bought the boat used and never asked. The engines were bought brand new in 2000 with factory warranty, so I doubt they changed anything. No issues with running lean and they have about 350hrs on them.

Thanks Griff

anymore help??

I have had GILs on my 502 MPI for 8 years. No problem.

Don't know if this helps, as not running Gils. But,I've got Stainless Marine on my '96 502 EFI's, with stock ECM's. Runs fine, no issues.

I have Gils on my 502, no issues, are you buying new or used?

I also have stock 2001 502 mpi's with CMI's and have had ZERO problems. In fact, cleaned up the black soot on the back after a hard run, picked up about 2 mph, and improved midrange torque. No ECM modifications. They also sound better as well!:-)

I do not have personal experience with this setup. But I know 502 mags run rich from the factory and leaning them out with better exhaust would probably be a good thing. If Griff say it works I would trust his judgement. He gives good advice. If in doubt install a wideband O2 gage. I have wideband O2 and it works perfect even a WOT.

My 2000 502mpi's have over 350hrs on them with this set up. I ran the MWBP ppoker run this weekend with the sticks on the dash for 90% of the time for the first 31 mile leg of the run. Mine are also dry to outside the transom.

90% of the time? Griff...are we fibbing again!!! :eek:

Gils, CMIs, anything shouldnt cause the engine to run so lean you would hurt anything. I dont know how this idea/rumor got started!! Probably just helping the engine breath and burn better!