Just installed a test pipe on my 328

What test pipes did you use?

 

He's got a 328, so he only needed ONE test pipe...

 

Are you able to detect any additional exhaust smell (from add'l unburned hydrocarbons)?

 

Gene,

your exhaust will smell more, it's simply a fact. Dyno runs on my car show little to no HP gain with the test pipe vs a cat. The HUGE advantage is peace of mind -- if I have a cylinder or 4 not firing, I no longer have a massive heat source awaiting the unburned fuel.

 

Gene, what did you do about the thermocouple that was normaly connected to the cat?

 

Can somebody tell me what I should do with my thermocouple cause I have a test pipe and it only has the thread to screw on the O2 sensor but none for the thermocouple. Thank you.

Mike

 

Hey mike, When I had the test pipe on the Mondial I used a big hose clamp and clamped it around the thermocouple to the top side of the test pipe. That was per the suggestions of a few other f-chatters.

 

Thanks John, I will install it this weekend try that.

 

Thanks, that is what I wanted to know, I am considering getting two made for my 308. I have been warned that the sound will be too harsh. It sounds like you are happy with yours.

 

The sound is not deafening. Just better. Lower at the bottom end in sound and higher at the top.

 

My mondi 8 has the 308 motor ofcourse. anyway it has the euro headers and seperate exhaust. the PO had the cats in and i tried driving around with them but you'd get a headache literially from the drone above 3k it messed with the resonance something awfull. muted lows and a droning high. as soon as the test pipes went in, it was night and day. i picked up a very sharp bark at idle and the drone was gone, it would progress to a very high pitched scream very similar to F1. I LOVED! it. alot of it may be due to the true seperate paths the exhaust flow takes.

now since i've added the supercharger it has removed some of the low bark and the high pitched scream is more meanacing.

 

COOL!

 

My 328 test pipe has a lot more exhaust smell at red light if the wind is not blowing. But when you are driving around the sound is way better and I swear it is quite faster. Overall better with the test pipe for me but my wife hates it!

 

I had the same issue... used the test pipe for a couple of years but finally had had enough of the smell. Changed to a HyperFlow performance cat from Daniel at Ricambi America and noticed NO difference in sound or quick revving, but it took care of that odor! Well worth it.