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BMW 3-Series and 4-Series Forum (F30 / F32) | F30POST > Technical Forums > N55 Turbo Engine / Drivetrain / Exhaust Modifications > CHALLENGE - F30 335 - HFC and Catless Downpipes - Now Released! - Pics inside -
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      12-05-2012, 07:49 PM   #1
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CHALLENGE - F30 335 - HFC and Catless Downpipes - Now Released! - Pics inside -

CHALLENGE - F30 335 - HFC and Catless Downpipes - Now Released!


HFC Downpipe

New for 2012! Challenge has designed their new F30 335i stainless steel catless downpipe. Each downpipe is made from 3inch mandrel bent stainless steel tubing and 200 cell metallic core cat. Custom machined 304 stainless flanges and formed mount brackets ensure a factory fit and long lasting performance. Current ECU version on US models are able to use this downpipe with no ECU flash or check engine light. Some models may require an ECU tune or flash. Off road or racing use only. Challenge exhaust parts are deisgned, engineered and manufactured in the USA.









Dyno graph of stock 335 before and after Challenge HFC Downpipe and Sport Catback Exhaust:





Catless Downpipe

Challenge has designed their new F30 335i stainless steel catless downpipe. Each downpipe is made from 3 inch mandrel bent stainless steel tubing. Custom machined 304 stainless flanges and formed mount brackets ensure a factory fit and long lasting performance. ECU programing will be required to use this part as the primary cat is removed. Off road or racing use only. Challenge exhaust parts are deisgned, engineered and manufactured in the USA.









Dynos of catless downpipe to come soon.



PLEASE EMAIL OR PM US WITH ANY QUESTIONS OR PRICING DETAILS

Last edited by GTM_Challenge; 12-06-2012 at 04:18 PM.
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      12-05-2012, 08:08 PM   #2
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Beautiful.... I don't know why I'm so excited to get mine since I don't have my car for another month!... When do they ship?
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      12-05-2012, 08:14 PM   #3
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Originally Posted by mikew2069 View Post
Beautiful.... I don't know why I'm so excited to get mine since I don't have my car for another month!... When do they ship?
Some have already shipped, and with others shipping Friday. Catless are on the shelf and HFC will have available units Friday also.
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      12-05-2012, 08:38 PM   #4
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Pricing?
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      12-05-2012, 08:44 PM   #5
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no link or pricing??
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      12-05-2012, 08:46 PM   #6
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Originally Posted by TreDirtyFive View Post
no link or pricing??
http://www.gtmotoring.com/index.php?...=&filter_id=22

Not sure if its allowed so may get removed. Please feel free to PM or email us with any questions.
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      12-05-2012, 09:01 PM   #7
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Quote:
Originally Posted by GTM_Challenge View Post
Some have already shipped, and with others shipping Friday. Catless are on the shelf and HFC will have available units Friday also.
Cool, hopefully mine is one that's shipped. Can't wait to see the dyno of the catless dp vs the hfc dp! I hope I'm not losing too much powa with the hfc!
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      12-05-2012, 10:03 PM   #8
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would like to go in for something like this to increase power but does it not bother people that the car does not remain street legal after these mods? Or is something like dark tints are also not street legal, but a lot of people do it anyway?
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      12-05-2012, 10:16 PM   #9
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will this fit xdrive?
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      12-05-2012, 10:54 PM   #10
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will this fit xdrive?
I have to confirm with BMW , but should be ok as long as the downpipe is the same for the rwd as the xi. Both units are the same or smaller then the oem
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      12-05-2012, 11:10 PM   #11
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Are you going to run a GB for the introduction? I'd be down for a catted version...NICELY crafted.
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      12-05-2012, 11:11 PM   #12
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and those 30 whp gains are with a catted DP + cat back?
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      12-06-2012, 01:26 AM   #13
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How much HP does each downpipe add? Also can you explain the difference between the two?

How much louder would this make your car once you add it? Is it going to be super noticeable to authorities, or would it still be low key?
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      12-06-2012, 07:50 AM   #14
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      12-06-2012, 09:55 AM   #15
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Quote:
Originally Posted by RollingHard28 View Post
How much HP does each downpipe add? Also can you explain the difference between the two?

How much louder would this make your car once you add it? Is it going to be super noticeable to authorities, or would it still be low key?
Dyno says a pretty consistent 12-20bhp.

AFAIK, because the cat's main purpose is to make the exhaust "cleaner," it doesn't affect the sound nearly as much as the muffler. From what I've seen on YouTube it seems to make the exhaust throatier more than anything else. The goal of removing the cat is to improve the flow of the exhaust. The catless pipe will be louder than the HFC.

Edit: This is from the stage1 thread:
Quote:
Originally Posted by brentmeister7592 View Post
Yes, it gives is a PERFECT not in my honest opinion. Just slightly louder and more aggressive, and since there is no more cat the turbo spool is very apparent
The main difference between Catless and HFC is that the HFC still tries to pass emissions standards. Therefore it sacrifices some performance gains to make it semi-streetable.

So long as the downpipe doesn't throw codes and your exhaust can pass emissions, you should be okay. IF you're caught though... well good luck.

Anyways, if you're going WOT past a cop in an exhaust modified (even the M-Perf exhaust) 335i then you're probably going to get pulled over with or without the modified downpipe.


As always - correct me if I'm wrong. I'm still a novice in this arena.
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Last edited by jsedlak; 12-06-2012 at 10:17 AM.
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      12-06-2012, 10:29 AM   #16
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Tune required?

I'm wondering how this would affect the PPK (assuming we can ever get it)
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      12-06-2012, 11:04 AM   #17
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Quote:
Originally Posted by shivaswrath View Post
and those 30 whp gains are with a catted DP + cat back?
Catted DP with our Sport exhaust. No ecu Tuning. Peak WTQ gains were 30 ft lbs, and peak WHP gains were 20 hp. The best part is there are gains across the entire powerband.
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      12-06-2012, 11:08 AM   #18
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Quote:
Originally Posted by RollingHard28 View Post
How much HP does each downpipe add? Also can you explain the difference between the two?

How much louder would this make your car once you add it? Is it going to be super noticeable to authorities, or would it still be low key?
Our dynos have been on tests with out full exhaust only at the moment. The HFC model has a 200 cell high flow cat on it which will still filter some emissions where the other has the cat completely removed for the highest flow possible. There should only be about a 5 HP difference between them with basic mods
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      12-06-2012, 11:26 AM   #19
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Quote:
Originally Posted by tdizzle View Post
Tune required?

I'm wondering how this would affect the PPK (assuming we can ever get it)
We have not seen any CEL for the HFC version on the current ECU version for the F30s. We tested this for about 3k miles. The catless downpipe will through a CEL and will require a tune or flash to correct.
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      12-06-2012, 11:29 AM   #20
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When will the sport exhaust be available?
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      12-06-2012, 11:43 AM   #21
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When will the sport exhaust be available?
We had some pre-orders that have first dibs. Beyond those, first units for stock should be in little after new years is our best estimate currently
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      12-06-2012, 12:02 PM   #22
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PM for pricing?
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