MSP Test Pipe

[callITaDAY]

Has anyone ever fabbed up a test pipe for the stock RB exhaust? Results?

 

[hornsfan10609]

Deleting the cats makes a huge improvement, as does upgrading to a 2.5" midpipe. You can gut the cats it would be cheaper and easier and would still pass visual inspection.

 

[blackwolf1778]

just did away with my rear cat havent got to the first one yet i feel a small improvment car sounds better to still running stock muffler atm though..
so as long as i put nofoul o2 in i should be ok on A/F right? sorry to jack your thread just didnt see the reason to start another to ask the same basic question hope you dont mind thanks

 

[hornsfan10609]

The stock catback is actually pretty good, not very restrictive and sounds nice without cats or with a high flow cat.

 

[callITaDAY]

Just a little update: a buddy of mine that owns a shop will be welding me up a j pipe and a midpipe for around $100, should be done in 2 weeks-ish

 

[RacingMazda.com]

it does help with the power.

 

[Valk]

how do you go about deleting them? just smash em out with a peice of pipe and a hammer? i had planned to repalce the whole exhaust very soon but looking like it wont happen until the new year now. i dont like the eggy smell. also, i remember reading the msp doesnt use the second o2 for tuning purpose?
it would throw a code but would it run ok if i had to leave it like that for a month or two?

 

[hornsfan10609]

Yeah most people just smash the cats out, looks factory and for the second O2 you can do the non fouler trick to avoid a CEL.

 

[Valk]

are non foulers just universal screw in bits?
I was thinking of pounding them out and slipping a pipe in where they would be, using exhaust clamps to hold in place. would that work? everywhere i read about gutting them says not to cause it creates a cavity. which makes sense.
then again. the piping on the stock exhaust seems quite a bit beefier than the cheap stuff you find with the exhaust clamps ha.