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08-13-2019, 12:49 PM | #1 |
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Active Autowerke VS Challenge X-Pipe - With HFC
Considering purchasing a new X-Pipe and I was wondering if anyone has experience with both the AA-HFC and Challenge-Sport X-Pipes. (I did search, found some limited information)
My current setup is stock X-Pipe with Dinan rear section. I have tried test pipes and I liked the sound but not the smell when starting my car inside my garage. I guess I was a bit of a princess... Alas, I have moved and situations have changed. I also feel the itch for a proper X-Pipe to get the most out of my M3 (I already have access to a good Stage II tune). I would like to avoid excess drone. Anyway, any thoughts on these 2 setups? I have read that the HFC location closer to the secondary cat location is a benefit for power production and is less prone to speed bump damage as the round cats fit better in that location. Not terribly concerned with HFC efficiency I have found some videos of the AA-HFC with Dinan pipes, but I have not found a video of the Challenge-Sport + Dinan pipes. Anyone have a good video of that? Thanks again for your comments and suggestions. Cheers,
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08-30-2019, 10:16 AM | #4 |
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The cats being in the secondary position on the challenge will not be as efficient as the active x pipe. I have heard them both and to me they both sound the same, the only reason I would go with the challenge is because about every active one has dented cats. They hang down really obviously from a side shot of the car.
The "X" isnt as nice on the active either but they do use V band clamps, not sure why challenge doesnt because over time the gaskets always start to leak.
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08-30-2019, 10:55 AM | #5 | |
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I ended up ordering a Challenge (RKP) Sport version. Did some digging and I also found that a lot of the AA owners mentioned the low hanging cats. Being I live in Canada where we have a special fetish with ridiculously bad roads, I want to make sure I do not install something that will get torn off... As for the gaskets, I guess I will just replace them when they leak. I have a QuickJack so at least it is not terribly difficult for me to levitate the car. Cheers,
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08-30-2019, 01:06 PM | #7 |
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Funny, i have Dinan mufflers with Evolve catted X-pipe, and want to switch to a non-catted dual resonated X-pipe. I find that while the catted X-pipe does help a little bit with smell (only works when cats are very hot), i think i like to sound better with a dual resonated X-pipe in front of the Dinan mufflers.
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08-30-2019, 01:13 PM | #8 | |
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10-03-2019, 08:48 AM | #10 | ||
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10-03-2019, 09:33 AM | #11 | |||
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10-09-2019, 12:08 AM | #12 |
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Just installed my RKP (Challenge) Sport x-pipe. The quality out of the box is top notch. The packing was, well, overkill. Took a while to actually free it of the packing - no change of shipping damage save driving over it with a large truck. Like a tool, I did not take any photos... Oops.
The install is pretty straight forward. I noticed the drivers side is a bit tighter than the passenger side for clearance. Fits fine, just need to be careful how you assemble the pipe. The smell with the HFCs is actually better than I had hoped. I think it smells less than test-pipes and the factory secondaries. So that is awesome. The sound is just fantastic. Idle is very pedestrian - what I wanted. Driving at light throttle is just a tad louder than stock but neighbour friendly. But, put your foot into it and it just sounds amazing with the Dinan rear section. Just sings. Very happy. I do have a bit of an issue with my Dinan cans being a bit different in length - drives me nuts. Clearly a manufacturing issue from Dinan that the previous owner did not notice. But I guess you cannot really see the tail pipes from the drivers seat... All in all, really happy with the new x-pipe. The HFCs seem to be located in a pretty nice position and should not be easily damaged as they do not hang down in the way. Here is hoping that I have many happy miles with this x-pipe! Cheers,
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10-11-2019, 12:20 PM | #13 |
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Great to here you like it... I'm thinking of doing the exact same thing. Have the Dinan full exhaust and it's pretty rich, so want to switch to a catted x-pipe and keep the Dinan rear section. Does it sound quieter when you stomp on it compared no cats? Just curious.
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10-11-2019, 02:16 PM | #14 | |
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One issue that I have is the RKP x-pipe is just a little longer than the factory. This pushes my cans back joust enough that the hangers hit the bumper support once the pipes are hot. I have to clearance it by a few mm. Not a big deal but something to watch out for with Dinan cans. Gunna fix it this weekend. Cheers,
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10-21-2019, 12:06 AM | #15 |
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I always loved the dinan setup. I think it's my favourite exhaust for these cars - and I've had around....6 rear sections. Currently on the hunt for another dinan. I had it previously with the dinan midsection and turner test pipes, but this time will have it paired with the gintani quad resonated x pipe. You should post some videos of your setup!
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10-23-2019, 08:24 PM | #16 | |
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10-23-2019, 08:42 PM | #17 |
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I had AA and I'd say challenge all the way!!!!
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11-01-2019, 07:29 PM | #18 | |
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Sounds good. What setup is this? |
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