Hi flow cat for EK4

[dsp26]

...and how often do you think this happens on a stock engine?!?
A basic hi flow cat is definately worth doing, as i said, so long as you are not putting down 800hp!!

lol.. ok... changing any part of the exhaust system will increase exhaust pop if you haven't noticed, especially on straight through systems.... oh and it always happens when you back off throttle....

the purpose of the cat is to ignite/burn uncombusted gasses...

but your right it rarely happens on a STOCK engine thats backpressured which he doesn't have

and any additional power that a cat can provide doesn't have much to do with size but rather the surface area of the catalyst, because an efficiency of a cat is also graded by how hot it can get.... efficiently burning the uncombusted gasses that pass through increase the scavenging effect of the exhaust system as it again accelerates gas flow out the exhaust... uncombusted gasses cool down the exhaust and slow down flow and reduce vacuum.