[mcbear]

Originally Posted by RBYCC

McBear

The main point of restriction is in the stock cat.

The Magnaflow spun metal cats as we have discussed for a while seem to give the most flow and still maintain emission control.

Many of the Euro kits just address the silencers, which over stock may sound better but provide no additional horsepower.

Agree that larger then a 2.5" pipe would be counter productive.

Best setup is just the individual high flow cats and a rear silencer ( two in the case of a V8)

Are you looking at an x-pipe in your system for balancing and scavenging ?

Ed A.

First system we looked at takes a single 3" in/out MagnaFlow HiPerformance CAT and a single 3" pipe back to the back exhaust silencer. It provided very good flow but we lost some backpressure. The 2.5" pipe should fix that. I have a former Penske Race Engineer that retired and lives in Lex that is doing the "tuning" part of the design. We started with 3" based on someone else's work and have worked it from that.

The next elements that we WANT to do is headers but there is so little room to work with that we just haven't taken the shop time to begin. That is where the big gain will be. Even the 500E manifolds are NOTHING to be very proud of. Their casting on the inside is sloppy and not very efficient. That is going to have to be next Spring's project. Things are stacking up.