|
|
08-27-2010, 01:57 PM | #1 |
Moderating
418
Rep 2,047
Posts |
DIY: How to butcher your Akapovic EVolutions Cats
In the spirit of achieving extra power without sacrificing drone and noise, I set about removing the insides of the 100 CPI HFCs that are standard on the Akrapovic Evolution full titanium system.
It took a leap of faith that the sound would not be too loud, or drone excessively. It also took over two hours of brute manual labor Tools required: 1. A tire iron (sharpened on a grinder) 2. A hammer 3. Perseverance 4. Time 5. Bravery to attempt this on a $6000 exhaust system I am pleased to report that the sound is almost identical to before, maybe ever so slightly raspier, but still ZERO DRONE. It is not louder at all. It sounds fantastic!! We managed to get every last bit of the fucking hard as hell bitching crap inside the cat chamber out. Fuck me I thought it would never come out, and a few times I was holding my head in my hands thinking what the hell am I doing? Herewith pics, videos of the butchering and the final sound clip. The car with the ESS VT2 600 is noticeably more responsive, and smoother to. In fact I nearly crashed on the way home as I lost traction in third gear changing lanes, while accelerating hard The car is so scary fast its insane!!! I loooove my ESS S/C and all I can say is you must go catless if SC. otherwise its like boning with a rubber (just not the same) Feels like at least an extra 20 whp to me Last edited by Bob MG; 08-31-2010 at 12:02 AM.. |
08-27-2010, 02:00 PM | #2 |
Brigadier General
326
Rep 3,882
Posts |
|
Appreciate
0
|
08-27-2010, 02:12 PM | #3 |
Moderating
418
Rep 2,047
Posts |
|
Appreciate
0
|
08-27-2010, 02:50 PM | #4 |
Major General
159
Rep 5,689
Posts |
Wow you sir are brave...
__________________
Legal Disclaimer: Anything I or anyone else says about my vehicle on this website(1addicts.com or any affiliated or nonaffiliated sites), pertaining to modifications, is only to gain acceptance from my/our peers, and does not actually represent anything actually existing on my car, and thus, cannot be held against me in any issues, i.e. warranty claims, that may arise.
|
Appreciate
0
|
08-27-2010, 05:45 PM | #7 |
Major General
285
Rep 6,007
Posts |
without the 100 cpi akra cats? I doubt 20hp from those. Maybe a couple. I can see 20 over other HFC's or OEM cats. But maybe, would be interesting to see
__________________
|
Appreciate
0
|
08-28-2010, 12:38 AM | #12 |
Lieutenant General
609
Rep 10,407
Posts |
Hmmm, is that you or your mechanic doing all of this terrible hard work...
__________________
E92 M3 | Space Gray on Fox Red | M-DCT | CF Roof | RAC RG63 Wheels | Brembo 380mm BBK | | Vorsteiner Ti Exhaust | Matte Black Grilles/Side Gills/Rear Emblem/Mirrors | | Alekshop Back up Camera | GP Thunders | BMW Aluminum Pedals | Elite Angels | | XPEL Full Front Wrap | Hardwired V1 | Interior Xenon Light Kit | |
Appreciate
0
|
08-28-2010, 12:39 AM | #13 | |
Moderating
418
Rep 2,047
Posts |
Quote:
Maybe Green Hell and others with FI and catless can comment on gains they got? Definitely the right thing to do with FI. I expected it to be louder and am relieved it's not!! I'm sure this thread will get a few DIYs done. |
|
Appreciate
0
|
08-28-2010, 12:41 AM | #14 | |
Moderating
418
Rep 2,047
Posts |
Quote:
Actually I was taking turns with the hammer and tire iron. I have tendinitis in my right elbow as evidence! Extremley hard to do, took around 1 1/2 hours per cat! Last edited by Bob MG; 08-28-2010 at 01:18 AM.. |
|
Appreciate
0
|
08-28-2010, 04:23 AM | #15 |
Grease Monkey
293
Rep 2,646
Posts
Drives: 2011 E90 M3,1994 Euro E36 M3/4
Join Date: Apr 2006
Location: Fort McMurray, Alberta, Canada
|
You sir are brave indeed!
The only issue is that those two big bubbles that used to be cats are going to effect exhaust velocity by creating turbulance because of their shape since they have no internals. The system will defenitely have less restriction than the cats would have had but will not flow as well as the Cat-less Akrapovic X-pipe. Kudos again for the balls to do this but with the mods you have done to your car I would have expected you to buy the Cat-less Akrapovic X-pipe..... money don't seem to be an issue for you! |
Appreciate
0
|
08-28-2010, 06:22 AM | #16 |
Moderating
418
Rep 2,047
Posts |
You probably right, but I have resolved to stop spending money!
The cat removal has made a performance gain without sacrificing noise levels, so I'm happy. The sound is a little like the CSL exhaust note now. Quite raspy which I love |
Appreciate
0
|
08-28-2010, 03:19 PM | #17 |
Lieutenant General
609
Rep 10,407
Posts |
That's cool. Just a small ribbing was deserved after all the complaining then seeing the video of your mechanic... Cheers. Nice mod.
__________________
E92 M3 | Space Gray on Fox Red | M-DCT | CF Roof | RAC RG63 Wheels | Brembo 380mm BBK | | Vorsteiner Ti Exhaust | Matte Black Grilles/Side Gills/Rear Emblem/Mirrors | | Alekshop Back up Camera | GP Thunders | BMW Aluminum Pedals | Elite Angels | | XPEL Full Front Wrap | Hardwired V1 | Interior Xenon Light Kit | |
Appreciate
0
|
08-28-2010, 11:36 PM | #19 |
Moderating
418
Rep 2,047
Posts |
|
Appreciate
0
|
08-31-2010, 06:33 PM | #22 |
Lieutenant
38
Rep 565
Posts |
Nice going. Could you not order it without the cats?
Very familiar Austrian Village by the way.
__________________
08 E90 335i AT RB Turbos -NX Wet Kit - Chiplogic Flash or Procede V5- M3 Diff - AE Exhaust- Forge Dv's - Helix Intercooler - AR DP's - P3 Boost Gauge - Vishnu Meth- Stett Chargepipe and CAI
09 C63 |
Appreciate
0
|
Post Reply |
Bookmarks |
|
|