Is there a big difference between high flow cats (Milltek) and Oem down pipes with no pre-cats ?????
About removing pre-cats....
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quattrosteph
- 4th Gear
- Posts: 710
- Joined: Mon Jan 23, 2006 10:23 pm
About removing pre-cats....
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 ?????
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
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
BMW 540i
2018 GTR
F90 M5
X3MC
RS3 Saloon
RS7 FL best car I've owned. No faith in turbo oil screen (turbos failing) or sticking oil scraper ring causing missfires.
F10 M5 LCI still no rear grip lol
S7 black Edition Too big and heavy
S3 8V FL DSG 310ps, road noise is a joke
RS3 8P Rubbish
C7 RS6 Fantastic car but missed playing
GTR R35 800bhp, too extreme, crazy fast though
911 Turbo Remapped. Hated it
F10 M5, awesome but no rear grip
RS6 V10 700BHP crazy
Porsche Cayenne Turbo S 600bhp
2018 GTR
F90 M5
X3MC
RS3 Saloon
RS7 FL best car I've owned. No faith in turbo oil screen (turbos failing) or sticking oil scraper ring causing missfires.
F10 M5 LCI still no rear grip lol
S7 black Edition Too big and heavy
S3 8V FL DSG 310ps, road noise is a joke
RS3 8P Rubbish
C7 RS6 Fantastic car but missed playing
GTR R35 800bhp, too extreme, crazy fast though
911 Turbo Remapped. Hated it
F10 M5, awesome but no rear grip
RS6 V10 700BHP crazy
Porsche Cayenne Turbo S 600bhp
I'll let you know tomorrow... 
Clive
S2 ABY coupe, S4 B5 saloon, S4 B6 avant
RS4 B7 phantom black saloon, mint, fully loaded, low mileage - FOR SALE!- http://www.rs246.com/index.php?name=PNp ... ic&t=88981
S8 D2 facelift, RS6 C5 saloon, both gone but not forgotten
S2 ABY coupe, S4 B5 saloon, S4 B6 avant
RS4 B7 phantom black saloon, mint, fully loaded, low mileage - FOR SALE!- http://www.rs246.com/index.php?name=PNp ... ic&t=88981
S8 D2 facelift, RS6 C5 saloon, both gone but not forgotten
Re: About removing pre-cats....
Um, don't the Milltek cats come with pre-cat free downpipes anyway?quattrosteph wrote:Is there a big difference between high flow cats (Milltek) and Oem down pipes with no pre-cats ?????
B7 S4 Cab
B5 RS4: MRC custom remap, Milltek 100cpi cats and rear system, RS6 8-pots, H&R PCS coilovers, H&R ARBs, AWE DTS, Tanoga Shortshift, Dynaudio / Focal / Genesis / iPod audio: SOLD, and still missed. One day....
B5 RS4: MRC custom remap, Milltek 100cpi cats and rear system, RS6 8-pots, H&R PCS coilovers, H&R ARBs, AWE DTS, Tanoga Shortshift, Dynaudio / Focal / Genesis / iPod audio: SOLD, and still missed. One day....
RE: Re: About removing pre-cats....
Yes, they do and are 200 or 100 cells.
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quattrosteph
- 4th Gear
- Posts: 710
- Joined: Mon Jan 23, 2006 10:23 pm
Bye Bye pre-cats!!
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!
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!
RE: Bye Bye pre-cats!!
I had gutted RS4 downpipes fitted on Saturday (along with RS4 OEM catback)
Feels good so far...
Feels good so far...
Clive
S2 ABY coupe, S4 B5 saloon, S4 B6 avant
RS4 B7 phantom black saloon, mint, fully loaded, low mileage - FOR SALE!- http://www.rs246.com/index.php?name=PNp ... ic&t=88981
S8 D2 facelift, RS6 C5 saloon, both gone but not forgotten
S2 ABY coupe, S4 B5 saloon, S4 B6 avant
RS4 B7 phantom black saloon, mint, fully loaded, low mileage - FOR SALE!- http://www.rs246.com/index.php?name=PNp ... ic&t=88981
S8 D2 facelift, RS6 C5 saloon, both gone but not forgotten
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quattrosteph
- 4th Gear
- Posts: 710
- Joined: Mon Jan 23, 2006 10:23 pm
pre-cats
Don't like cats anyway!!! Ask my Bull-Terrier as well!! 
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