330ci Exhaust questions!! RHD exhaust system-upgrade!!
I need your help, knowledge and opinions on my exhaust upgrade thoughts..
I live in Greece and i have an E46 coupe (LHD).. car was a 2lt 4cyl (318ci 143ps) and i did last year a complete 330 engine swap from a UK 330 (RHD)..
I see that the RHD models have differences compared to the LHD ones..
Check this out..
This is my OEM RHD header & cats http://bmwfans.info/parts/catalog/E4...with_catalyst/ (i plan on upgrading them also, i just don't know if im gonna do it all together or do a cat back system now and do headers & cats later) and after that it has this section http://bmwfans.info/parts/catalog/E4...ront_silencer/ (the first one) which says "exhaust pipe with catalyt.converter"... What the f...?? The RHD M54 models have 4 cats total..??:hmm:
A friend told me that UK models produce less hp.. Is that true..??
The rest part of the exhaust is the same between RHD and LHD models.. http://bmwfans.info/parts/catalog/E4...rear_silencer/
What i want to do is to upgrade my exhaust to get maximum hp without being very loud.. I hate drone.. I have a friend with a compact E46 325ti M54 with custom centre muffler and rear silencer and does a very nice E36 M3 style sound..
Future exhaust upgrades are ebay headers with universal 200 cell metal cats..
I want your help with the cat back..
The exhaust from the RHD fitted my car (LHD) perfect without ANY mods..
Right know the only thing i have changed is the rear silncer with a custom one..
Here is a video.. Not the best one (mobile phone) but you can understand a bit the exhaust sound.. Of course live is way better..
I want to keep my existing custom rear silencer..
I see that some cat back systems like the Blue Flame, UUC etc have twin silencer systems..Other cat back systems (supersprint for example) use x-pipe (what does it do?) and then the 2 pipes go into one centre silencer and then again 2 pipes into one rear silencer..
Scorpion exhaust offers a cat back system with 2 pipes going into ONE front silencer then into ONE centre silencer and then into ONE rear silencer..
Jetex has different route.. 2 pipes into ONE front silencer then 2 pipes into ONE centre silncer and then ONE pipe goes into the rear silncer..
What is the best exhaust upgrade route for maximum hp without crazy sound..??
Which system is the best..??
What do we achieve with the twin silencer or the use of ONE silencer or single piping..??
I don't want to lose low end torque and gain high.. I want some overall hp (if it's doable) with a nice sound..
If i change only the silencers without changing the pipes will i get any hp?
Should i delete these catalytic converters http://bmwfans.info/parts/catalog/E4...ront_silencer/ ?? should i add an x-pipe, just pipes or small free flow silencers..??
Sorry for the loooong post!!!:)
Thanks in advance!!!
I see that supersprint http://www.supersprint.com/en/prod-5...093E280BA.aspx puts the x pipe http://www.supersprint.com/en/prod-c...m_pre_kat.aspx here that my exhaust has these catal.converters http://bmwfans.info/parts/catalog/E4...ront_silencer/
Iam thinking of making a custom x pipe (instead of paying 400+ euro for the supersprint) and then i will see.. What do you think..??
The original pipe diameter is 2" (50,8mm)??
Any tips or anything else that i should be carefull while building the x pipe..??
Hi, I have a RHD UK 330. It does have 4 cats total and produces 231hp.
The RHD headers are different to the LHD design, I consider them less 'pinched' where the 3 ports join to 1 before they go into the cat. If you look at the LHD headers you will see what I mean. However the RHD headers head upwards and towards the front of the car before doubling back so it's probably even.
Considering your car is LHD you have many aftermarket options available, remember that the RHD headers DO NOT have all the holes drilled for studs in the head. If you look at the flanges in the link you posted you will see there are gaps in the stud pattern. This means you will have to put those studs there (i.e. drill and tap the holes) or use a header that has joined-up flanges.
I'll try to answer more questions later
I know what you mean about the difference between LHD and RHD oem headers..
If i understand correctly.. Are you talking about the holes for the bolts that are on the flanges..?? I can see from bmwfans.info that the RHD headers have 8+8 holes and that the LHD headers have 12+12!!
Very useful detail info!! Thanks mate!! :thumbsup::bow::) Although iam gonna deal with the front section/catal.converters right now and do headers & cats later (maybe in the winter)...
Yes what I mean is that the cylinder head also does not have those holes for the studs which is causing me problems at the moment. So basically if you have headers where the flanges are missing stud holes your cylinder head will also be missing those holes.
Very useful info, thanks again Dan..
Are you upgrading your exhaust system also..??
When removing your oem header you can have an idea how the holes are.. If you have an ebay header (for example) and follow the hole pattern of your oem and drill some holes where needed and then weld others that you don't need (probably), do you think this should work that way..??
:bump:Any other suggestions about the cat back or the replacement of the front silencer-catalytic converter (this one exists only in RHD models)..??
I might make the x-pipe tomorrow guys..
2" (50.8mm) is the inside diameter or the outside..?? I belive it's inside..
I can't find (in any shop at the island that i live) a bit bigger diameter than stock.. I find bends 60mm and tubs 50.8 (when i try to bend the 50.8 it gets smaller so we go 48!!!).. Iam trying to make the best possible without killing flow.. I want, not to affect performance.. i want to gain something if it's possible, not do it worse..
What do you guys think..??
Here is the OEM section before we cut it..
Welding the x-pipe...
Done.. (i think iam gonna paint it all black.. the silver is a product that my friend sprayed to prevent rust)
I will make a video and upload it when i can.. :D
Nice sound, sounds like E36 M3 a bit and not loud (as i wanted it).. My gf didn't realize the difference in sound.. It was what i wanted, no drone, not very loud and to sound nice..
Filmed with Canon G12
OEM M52 headers, 200 cell Magnaflow cats...
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