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BMW 3-Series (E90 E92) Forum > E90 / E92 / E93 3-series Powertrain and Drivetrain Discussions > NA Engine (non-turbo) / Drivetrain / Exhaust Modifications > Gruppe M Replica VS authentic. Anyone know the difference?



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      08-27-2012, 04:29 PM   #1
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Gruppe M Replica VS authentic. Anyone know the difference?

Just like the thread says... I have the opportunity to pick up a replica intake from another forum member but am a little worried to pull the trigger on this one. I know that it is not an enclosed box but does isolate itself from the rest of the engine.

I also know that the authentic intake system is made out of Kevlar/CF so how does this compare to the replica intakes out there in preventing hot air suction?

Thanks!
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      08-27-2012, 08:35 PM   #2
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well intakes have been discussed a lot. closed vs open and yada yada. in the end, i don't think it matters as much as you think. the main thing about the gruppe M (authentic) is that its filter is conical and has a large surface area which is also less restrictive than stock. moreover, it has a large volume of air to work with unlike a closed intake. the front duct also has scoops too. when you're car is moving, i don't think the hot air will be a big difference because the sides closest to the engine are shielded.

as far as the rep goes, i'm sure it's about the same. the front duct, if it comes with one probably wont have scoops. the filter will probably be a K&N (used by authentic). only difference might be quality of the cf and fitment.. but functionally it should be about the same.

just FYI i've owned gruppe M (authentic) in the past, but now i have the oem performance intake. main reasons for switching was because at the time, i lived in a really dusty area--like quite literally a day after parking, my car would have a layer of dust on it. so, open intake probably not the best idea if i don't want to deal with cleaning the filter all the time
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      08-28-2012, 04:36 AM   #3
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Quote:
Originally Posted by just4kickz View Post
well intakes have been discussed a lot. closed vs open and yada yada. in the end, i don't think it matters as much as you think. the main thing about the gruppe M (authentic) is that its filter is conical and has a large surface area which is also less restrictive than stock. moreover, it has a large volume of air to work with unlike a closed intake. the front duct also has scoops too. when you're car is moving, i don't think the hot air will be a big difference because the sides closest to the engine are shielded.

as far as the rep goes, i'm sure it's about the same. the front duct, if it comes with one probably wont have scoops. the filter will probably be a K&N (used by authentic). only difference might be quality of the cf and fitment.. but functionally it should be about the same.

just FYI i've owned gruppe M (authentic) in the past, but now i have the oem performance intake. main reasons for switching was because at the time, i lived in a really dusty area--like quite literally a day after parking, my car would have a layer of dust on it. so, open intake probably not the best idea if i don't want to deal with cleaning the filter all the time
thank you for the input, I already have RPI scoops installed on the car so that no problem. I don't expect power gains just a nice growl. my brother has a gruppe M intake on his e46 and am in love with the sound of his car, so that's why I show an interest to it. My main concern was the construction of the replica shield so thank you for clarifying!
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      08-28-2012, 05:22 AM   #4
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I read the same things OP about heat soak. Just4kickz is right, as long you drive forward you're not really sucking any hot air and we both have scoops. FYI only ONE weird time at 75mph highway my gruppe-m and scoops made me throw a code "running to rich" brought it to the dealer and they cleared it.

I guess you haven't heard any of my exhaust videos. I guess I'll make some later today to clarify exhaust sound that'll be coming out.
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