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So, how many of you had their pre-cats removed? Did it work for you very well? Anybody had a rolling road after the mod?

Is there a big difference between high flow cats (Milltek) and Oem down pipes with no pre-cats ?????

Me

Yes very well

No rolling road but after gutting my pre-cat I could run more boost and ignition advance so reduced my FATs time by nearly a second

No Idea

Deffo a good worth while power and spool up time mod

I'll let you know tomorrow...

quattrosteph wrote:Is there a big difference between high flow cats (Milltek) and Oem down pipes with no pre-cats ?????

Um, don't the Milltek cats come with pre-cat free downpipes anyway?

Yes, they do and are 200 or 100 cells.

Well, had my pre-cats removed today, very impressed with the mod. I do not feel any difference at low rev but start around 3400, 3600 it pull harder right to the red zone, very impressed i have to admit
The sound is much deeper under acceleration, very nice, not over the top.

I had a good look at the oem pre-cat while on the floor and i still can't believe how many holes there are and how small they are!!! It did restrict the flow for sure (around 400 cells per inch2!!!!!).

Will be curious to see the difference on the rolling road, i am pretty sure about minimum 10 BHP.

Damn!! now i think i need a brakes upgrade!

I had gutted RS4 downpipes fitted on Saturday (along with RS4 OEM catback)

Feels good so far...

Don't like cats anyway!!! Ask my Bull-Terrier as well!!