Test Pipe or CAT???
 

Just curious if I yank the Cat and replace with Test Pipe, what will I notice??? O2 is disconnected anyway. I have a Dual Out Sport Muffler. Thanks. John

Mine has a deepre exhaust tone but can't tell if I'm getting any extra hp without dyno. I took it off to lower the temp on that side of the engine. It gets hot down here.

I think it depends on what you replace the cat with.

You mention a "test pipe" I don't think these provide as much benefit as a euro cat bypass. I have a Fabspeed bypass pipe that is very simliar to the euro bypass. I noticed a little bit more noise and a little bit more power. Would I do it again? Yes. I have a RUF sport single in dual out FWIW.

-Jeff
nolift911@hotmail.com

I have a euro premuffler as well. It is hooked up to a Bursch. It drones a little bit between 2500 to 3000 rpms. It is supposed to gain more HP than a test pipe since it is tuned to the exhaust system. I can't really tell though.

After a ton of research (on this site), I went with a euro-type cat bypass because it gives the slight backpressure needed to outperform test-pipes in adding horsepower (the testpipes supposedly add none). What I really wanted though was to run a bit cooler and not ruin my cat with my richer than stock fuel mix.

HP? Maybe a touch, but nothing significant.
Noise? A *little* deeper and louder
Temp? Id guess it runs 10 degrees cooler over the cat.

I bought mine on ebay and have seen them there fairly often

Cheers!
Patrick

If your looking for a test pipe I have one from a 83 SC with about 50 miles on it with O2 bung in it, in the orignal box It belongs to the guy next door $80+ shipping email me if you are interested gregkone@yahoo,com

I can't seem to get an answer to this question...." Will richer than stock mix burn the cat? Is this true? Has it been proven?"

Thank you all!

Yes it's proven and a common problem that occured on all types of cars when cat.-converters were first introduced. A rich fuel mix would melt the core together inside the converter. By design the they heat up to burn off some un wanted emmisions.
One example was the 20 year old volvos that used to have a test port that you could unplug to check if it was melted down. I remember unplugging them to see if that would fix a running problem under load or accelerating. I'm sure it was originally designed to hook up a pre and post sniffer for tuning but, it was handy to see if the cat-conv. had melted down.