Angel meets Devil - HJS Euro 6 Downpipe & M performance Exhaust Sound Clip and Review

AK.Alexx · 02-05-2018, 01:25 AM

Thanks to your review, I now have a Akra sportcat paired with my MPE. Sounds LOVELY! Pretty loud, but a nice sound. Not raspy. Just the same as stock MPE. But louder, deeper, more raw. And loud pops ands bangs. Love it!

But is there a way to keep the OEM valve open? Sound is louder when standing still in sport/sport+ compared to comfort or traction... wonder what traction mode would sound like when the OEM valve also opens

SeanWRT · 02-05-2018, 08:02 PM

Quote:

Originally Posted by AK.Alexx

Thanks to your review, I now have a Akra sportcat paired with my MPE. Sounds LOVELY! Pretty loud, but a nice sound. Not raspy. Just the same as stock MPE. But louder, deeper, more raw. And loud pops ands bangs. Love it!

But is there a way to keep the OEM valve open? Sound is louder when standing still in sport/sport+ compared to comfort or traction... wonder what traction mode would sound like when the OEM valve also opens

Akra catted dp and HJS one are exactly the same thing, inside and out, meaning our turbo back systems are identical.

OEM Valve is open all the time in S and S+. Awron gauge can control values for you. Alternatively JB4 and BM3 have user adjustable valve options.

In real world, everyone will notice OEM valve makes negligible difference in sound when MPE valve is open. It makes all sense to me, as MPE valve is placed at right side, where most flow gets straight out much more freely. OEM valve on the left side, the flow has to take a big turn to get there so much less air pass it to begin with.

AK.Alexx · 02-06-2018, 04:06 AM

I also agreed what you said. It’s not the loudest setup, but sound is beautiful. And it isn’t quiet either..

Traction = comfort. I know valve is open in sport or sport+.
Would pops and bangs even louder in traction with the OEM valve open? Like sport

OLO-M2 · 06-16-2018, 08:34 AM

Thanks for your interesting post !
I was considering going for the same set-up but I read that MPE + sport cat was way to loud ;-)

I regularly go on tracks with noise limitation. Any idea on dB ? Could you please measure it with / without valve activated in Sport+ mode ? You can easily find a dB app for iphone ;-)

Thanks mate !

02-05-2018, 01:25 AM	#23
AK.Alexx Private First Class 50 Rep 111 Posts Drives: BMW M2 on order Join Date: Feb 2014 Location: BELGIUM iTrader: (0)	Thanks to your review, I now have a Akra sportcat paired with my MPE. Sounds LOVELY! Pretty loud, but a nice sound. Not raspy. Just the same as stock MPE. But louder, deeper, more raw. And loud pops ands bangs. Love it! But is there a way to keep the OEM valve open? Sound is louder when standing still in sport/sport+ compared to comfort or traction... wonder what traction mode would sound like when the OEM valve also opens
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02-06-2018, 04:06 AM	#25
AK.Alexx Private First Class 50 Rep 111 Posts Drives: BMW M2 on order Join Date: Feb 2014 Location: BELGIUM iTrader: (0)	I also agreed what you said. It’s not the loudest setup, but sound is beautiful. And it isn’t quiet either.. Traction = comfort. I know valve is open in sport or sport+. Would pops and bangs even louder in traction with the OEM valve open? Like sport
	Appreciate 0 Quote

06-16-2018, 08:34 AM	#26
OLO-M2 Private First Class 38 Rep 177 Posts Drives: M2 Join Date: Jan 2017 Location: Belgium iTrader: (0)	Thanks for your interesting post ! I was considering going for the same set-up but I read that MPE + sport cat was way to loud ;-) I regularly go on tracks with noise limitation. Any idea on dB ? Could you please measure it with / without valve activated in Sport+ mode ? You can easily find a dB app for iphone ;-) Thanks mate !
	Appreciate 0 Quote