After a lot of consideration, and talking to several peoples, I've came up with a conclusion that a 'single pipe' (two exhaust pipes joined into one after the cats) exhaust would be most suiutable for me - I want a exhaust that is simle, gives nice and smooth sound, and it doesn't bother me if it's loud (as long as it doesn't rattle on acceleration).
The system would go:
downpipe - 54mm pipe with 45° turn (one one each side), joining into one 63.5mm (2.5") pipe in center of the car - flow-trough resonator (optional) - 63,5mm pipe - STD 3.0 backbox
More-or-less, I'd copy the systems from links:
http://www.omegaowners.com/forum/index.php?topic=54996.msg830517#msg830517http://www.omegaowners.com/forum/index.php?topic=103756.msg1299433#msg1299433BTW, thanks to Mr.OmegaMan, VXL V6, minifreek for a feedback on your systems and experiences
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WARNING - BORING STUFF
I see that V6 omegas with single mid section was quite common thing in UK several years ago, and that feedback is mixed:
- ones that are made by random exhaust shop - using Y-connection, single mid pipe and one mid box - usually claim some power loss - IMO, this is probably caused by poor design which comes with many exhaust shops when they do custom work (sharp turns, Y-part at to big angle making exhaust pulses coliding, not enough diameter for single pipe)
- others (like one in links fiven before), that have better design, where flow is an key factor - claim no power loss (or even some increase)
Why I think that single pipe is a good option:
- Our V6 engines, when used in other applications (Vectra, Saab...) have this setup, and it works and sound nice
- only other RWD application of this engine was in Cadillac CTS - and it had cats on each bank, resonator with 2 inlets and 1 outlet - and it had no power loss compared to Omega
- less weight, cheaper to make
- I'm quite sure that purpose of original twin pipe setup was purely to obtain quieter sound (suitable for that kind of car), and not to give extra performance over the single pipe setup
- most of the V6 cars use single exhaust setup
- most of the modification to the V6 omega exhaust system end up with rattle and nasty sound - this is, IMO, due to the nature of the twin exhaust setup - until it reaches the back box, it's basically a big 3-cyl engine - and they all sound nasty
- on the other hand, FWD V6 Opels - which have single pipe - are not that sensitive - you can do various 'chav' mods to the exhaust, which will make it loud, drone and similar, but will not rattle and knock under acceleration
