Originally posted by rbtree
Here's what Walker's does...stock port covered up with one 5/8th tube.
Rbtree, I've got the 335 muffler off and everything makes sense.
It appears that if you go the walker method. You need to drill deep into the secondary baffle to open up to 5/8 size to match the new 5/8 outlet.
Your method appears to be the simplest.
But which on is better?
Not very scientific, but I calculated the volume by inserting small round spegetti noodles into a 5/8 round tube, the rectangular exhaust flange and the sloted original exhaust port.
Results, total noodles inserted into:
71 into exhaust flange
59 into round 5/8 tube
15 into sloted stock exhaust port
Walker with 5/8 only port = 83% of exhaust flange size
rbtree mod with 5/8 + stock port left open = 103% of original flange size
Using the rule of thumb 1x to 1.25x of exhaust flange size. It appears the rbtree mod is closer to optimim.
Which method shall I use for a stock 335?