Hi,
I am in search of an alternative for a catalytic converter. I do not want an aftermarket converter or to re-install used stock converters every year (as they clog). What I want is to weld in something in place of the stock converter….on a stock mod pipe. Emissions testing is not a problem. I know about the silencers (Borla and other alternatives).

It needs to:

Provide enough back pressure to prevent the massive boost creep my car has with a straight pipe.

Quiet the car as much (or very close) as a converter.


Restrictor plates would control boost… But not the noise… straight through mufflers in the mid pipe are still too loud for me.

I want something to control noise that won’t clog over time and be quiet without limiting flow more than a converter… Any ideas?

 

restrictor plate + resonator should do it.

 

That's gonna be your best bet for what you're looking for.

 

Do you just ask a shop to make you a restrictor plate? And what size?

 

i'm contemplating using one of the new metal cats and weld it into a standard mid pipe. should last longer than the standard hi-flow ceramic cats.

do a search on here for metal cats or catalysts.

 

http://www.hjs-motorsport.de/english/index_js.htm

company in Germany, famous for it's katalytic knowledge and builds sport kats to your need.

I can get one (diameter 120mm, inlet/outlet 70mm) for about 450$