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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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      12-07-2012, 03:59 PM   #45
chrisv_335EBII
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Originally Posted by mikew2069 View Post
Are you going to run it w/ stock catback? I've been so close to pulling the trigger on the Challenge sport exhaust but I'm nervous it might be too loud for my taste as a DD.
Exactly where I am. I'm waiting till a few more people post reviews for me to make a decision.
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      12-07-2012, 04:12 PM   #46
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Originally Posted by cchrisv View Post
Exactly where I am. I'm waiting till a few more people post reviews for me to make a decision.
Not a bad idea. I was just waiting till I get the wild hair to pull the drigger... Definitely the best sounding system though. Just hard to judge the actual volume level from a video.
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      12-07-2012, 05:46 PM   #47
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Originally Posted by mikew2069 View Post
Are you going to run it w/ stock catback? I've been so close to pulling the trigger on the Challenge sport exhaust but I'm nervous it might be too loud for my taste as a DD.
No, I couldn't wait for the challenge catback exhaust ( I did want though), but ended up pulling the trigger on a barely used Meisterschaft exhuast kit, so I will be running the DP with that..I am hoping to get both on at the same time. Exhaust is coming in next week and the DP should be coming sometime soon as well..
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      12-07-2012, 05:47 PM   #48
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Originally Posted by GTM_Challenge View Post
Thanks for your business, Chris!
Thank you as well! I appreciate it.
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      12-07-2012, 06:13 PM   #49
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Originally Posted by RollingHard28 View Post
No, I couldn't wait for the challenge catback exhaust ( I did want though), but ended up pulling the trigger on a barely used Meisterschaft exhuast kit, so I will be running the DP with that..I am hoping to get both on at the same time. Exhaust is coming in next week and the DP should be coming sometime soon as well..
Cool, can't wait to hear it. I was very much considering buying the Meisterschaft thats for sale in the classifieds right now only b/c you have the option to quiet the exhuast and the level of volume is my main concern. But I kept comparing the sound of the Meisterschaft to the Challenge and I am just so much more in love w/ the Challenge sound. I'll probably end up buying it and if its too loud for my taste, I'll just have to sell it and eat a couple hundy.
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      12-07-2012, 11:14 PM   #50
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I want to hear the exhaust without the downpipe. I think the BMW performance exhaust with the HFC downpipe might be the perfect combo.
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      12-07-2012, 11:22 PM   #51
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I want to hear the exhaust without the downpipe. I think the BMW performance exhaust with the HFC downpipe might be the perfect combo.
I am pretty sure Challenge has a video of just there catback exhaust only; and have another video with exhaust + the downpipe.

Both sound good in my opinion
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      12-07-2012, 11:23 PM   #52
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Originally Posted by mikew2069 View Post
I ordered the HFC. They're saying its only about a 5hp difference b/t the two which isn't a big deal. I went catless on my last turbo car and have a bad taste in my mouth from that experience so I think this will be perfect.
When you say you went catless and had a bad taste from experience, what was it about it to make you say that?
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      12-08-2012, 08:07 AM   #53
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Catback exhaust:


Catback With HFC:
(Btw, is that the wheels chirping in the gear shift, or is that a turbo part?)
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      12-08-2012, 08:43 AM   #54
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Quote:
Originally Posted by RollingHard28 View Post
When you say you went catless and had a bad taste from experience, what was it about it to make you say that?
A couple reasons - all related to a different car and NOT Challenge's products so this is nothing related.

1) Too loud for my personal taste as a daily driver. I would always get a loud drone in the low rpm range that drove me crazy. And the cold startup shook the house. lol
2) CEL would always come on. I was able to reset it using the Torque app and bluetook dongle but it was still annoying.
3) Very dirty. My exhaust tips would get dirty as all hell in one day.

My ONLY concern is the overall volume of the Challenge setup. There's no way to tell unless you hear it in person. For the average person, I'm sure its perfect but I use my car sometimes for business and in my other car, it was sometimes difficult to take a call in the car it was so loud. If I need to take a customer to lunch, I don't want it too loud for them if that's not their thing, and I don't want my neighbors looking at me crazy like with my last car.
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      12-09-2012, 06:55 AM   #55
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catless DP for the n55 - 2nd performance mod to increase max hp.
will throw a CEL on the dash.
will be smelly if u roll down your windows.
the power gains is excellent.


with the HFC (high flow cats) should eliminate the
smell.


DP looks great Challenge - do you have any install picts
for these guys to see.


with any performance mod'n, it's at your own risk.
just research and know what you're getting into.
happy modding.
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      12-10-2012, 04:20 PM   #56
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Good stuff guys! Looks like a great product and we can't wait to get our hands on one
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      12-12-2012, 01:22 AM   #57
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Quote:
Originally Posted by GTM_Challenge View Post
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
What HP and torque gains would you see from a HFC dp only? Same question but for the cat back only too?
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      12-15-2012, 03:12 PM   #58
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Just received my Challenge HFC DP! Packaging was over the top (good thing) and the quality of the welds and overall product is top notch. Can't wait to have a car to install it on!

Thanks Austin at GTM!
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      12-17-2012, 10:37 AM   #59
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Quote:
Originally Posted by mikew2069 View Post
Just received my Challenge HFC DP! Packaging was over the top (good thing) and the quality of the welds and overall product is top notch. Can't wait to have a car to install it on!

Thanks Austin at GTM!
No problem, Mike! Glad it arrived safely. Let us know what you think when you get your car and get the DP installed!
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      12-19-2012, 12:50 PM   #60
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Quote:
Originally Posted by mikew2069 View Post
Just received my Challenge HFC DP! Packaging was over the top (good thing) and the quality of the welds and overall product is top notch. Can't wait to have a car to install it on!

Thanks Austin at GTM!
I can't wait to get mine still! Soon I hope!
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      12-22-2012, 02:05 AM   #61
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Any dynos out for the catless Dp? I cant wait to get one.
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      12-22-2012, 02:08 AM   #62
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Btw, can someone tell me the differences between 3'' dps, and 4'' dps? cant find any info online.
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      12-23-2012, 05:20 PM   #63
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Where can I buy it online?
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      12-26-2012, 05:32 PM   #64
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Where can I buy it online?
Here is a link to additional info and pricing etc.

http://www.gtmotoring.com/index.php?...=&filter_id=22
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      12-26-2012, 05:33 PM   #65
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Quote:
Originally Posted by michaely12 View Post
Any dynos out for the catless Dp? I cant wait to get one.
sorry no dynos on catless downpipe just yet.
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      12-26-2012, 05:56 PM   #66
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Btw, can someone tell me the differences between 3'' dps, and 4'' dps? cant find any info online.
1"
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