Got the Y-Pipe .... my feedback ...

Post by **bikermeow** » Fri Apr 07, 2006 12:03 pm

My tech fitted an old Y-Pipe (2 Bros) on my R, stock pipe .... now my bike backfires, I thought I lost a tad low-end but the bike has a deeper growl and better top end.

Are these the usual outcome for a Y-pipe change? Bike's slighter lighter now, best part.

Cheers

Meow

bmerchant · Post by **bmerchant** » Fri Apr 07, 2006 2:17 pm

I reckon it probably backfired before, it was just more muted with the collector box in place.

Airman · Post by **Airman** » Fri Apr 07, 2006 2:28 pm

bmerchant wrote:I reckon it probably backfired before, it was just more muted with the collector box in place.

I believe that's true. I have a Remus y-pipe and it will sometimes pop a bit when you shut the throttle. I do think it is muffled by the CAT when you have that installed. I have not noticed any performance changes myself. It has a lower sound, but if you really want some sound, pull the muffler off. You'll sound like the Red Baron making a strafing run.
The nice thing about experiments like that is that the Harley Straight-pipes have made it impossible for the police to give you a ticket for noise.

Croc · Post by **Croc** » Fri Apr 07, 2006 5:05 pm

I have also fitted the Remus Y piece and also fitted a K&N filter. There may be a slight improvement in performance (or perception) but there is a great improvement in sound!!

Also get the occasional backfire but that gives it character!

I have noticed that the engines braking is slightly reduced - is this because there is less back-pressure?

Croc

orbea54 · Post by **orbea54** » Fri Apr 07, 2006 5:53 pm

You should go ahead and put some type of aftermarket exhaust can on there. It will sould real good. I have the Remus Y-Pipe and Ti can, it simply sounds awesome. People are always amazed that a BMW can sound that good. Quite at idle but barks when on the gas.

Also, the actual weight saving from dropping the cat and stock pipe is 23 lbs. Thats pretty significant. Plus you get the benifit of not having that hot cat under the transmission. Yes I get a few pops and backfires, here and there but it does not bother me. Like the guys said, it adds a little character to the bike.

phreakanature · Post by **phreakanature** » Fri Apr 07, 2006 8:25 pm

I have a 2005 R1150R, and want to do this. Does taking off the Cat. and stock pipe void the factory warranty? would it make a difference if a dealer does the install?

Post by **bikermeow** » Fri Apr 07, 2006 8:53 pm

Ask your dealer; better still; get some confirmation by e-mail or something.

Thanks for the feedback ... the other thing is; I've heard that with a Yipe, the muffler will run hotter; hence the need for heat shield on the stock left pannier ... Urban legend or truth?

Yes; will look into after market muffler; although I thot most of the weight savings comes from the removal of the Cat?

Cheers

Meow

vinman · Post by **vinman** » Fri Apr 07, 2006 9:50 pm

I have the staintune Y pipe and muffler. I get the occassional backfire too but only when I shut the throttle quickly. It definetly has more character now, much better than the sewing machine sound it had before.

mechanic savant · Post by **mechanic savant** » Sat Apr 08, 2006 1:50 am

I'm w/vinman on this one . made myown cat eliminator 2yrs ago .also swiss cheesed the intake snorkel .occasional backfires when you chop the throttle ..but it seems to pull stronger all the way to red line ..opening up the air intake gives a pleasent (to me ) intake honk similar to a quad opening on an older muscle car

Post by **Beemeridian** » Sat Apr 08, 2006 11:44 am

fnfalman · Post by **fnfalman** » Mon Apr 10, 2006 2:22 pm

Most bikes run lean; especially BMWs, in order to pass emission test and to wring out the best gas mileage. So when you slap on aftermarket cans and in the case of full system or Y-pipe as well, the bike really runs lean.

It's best to take it in to somebody who knows what they're doing and they will put the gas analyzer into the exhaust and adjust the idle/air/fuel mixture in order to get rid of the leanness and the backfiring.

My Rockster was backfiring occasionally for a whole stinking year until I got a hold of somebody who knew what he was doing. She's purring like a kitten now.

Most competent dealerships know how to do this retuning but I guess they don't do it as a part of the installation package for whatever reasons.

Airman · Post by **Airman** » Mon Apr 10, 2006 7:06 pm

mechanic savant wrote:I'm w/vinman on this one . made myown cat eliminator 2yrs ago .also swiss cheesed the intake snorkel .occasional backfires when you chop the throttle ..but it seems to pull stronger all the way to red line ..opening up the air intake gives a pleasent (to me ) intake honk similar to a quad opening on an older muscle car

I think you're just making music by opening the intake snorkle. You can only get as much air as the air filter will pass. San Jose BMW makes a kit to open the intake and uses a larger K&N filter. I think Dean did this to his RR as well as the pipe and chip upgrades. It's a mod that probably works best at top end where you usually run out of air.

mechanic savant · Post by **mechanic savant** » Tue Apr 11, 2006 4:32 am

But I loves that music !!! thought about the k&n mod & decided against it when I saw how poorly they filter ..I do a fair amount of my sport touring on secondary roads , grey lines on the maps & dirt roads.I'm trying to keep the nastyies out of the engine..also resale value is always in the back of my head too ...recently traded my 02r towards an 04ra & the dealer was happy to see a 99% stock bike ..so I try to keep mods "unboltable" perhaps when the new bike is outa warranty it'll get the cat eliminator which is collectin dust in the shed

Airman · Post by **Airman** » Tue Apr 11, 2006 11:32 pm

mechanic savant wrote:But I loves that music !!! thought about the k&n mod & decided against it when I saw how poorly they filter ..I do a fair amount of my sport touring on secondary roads , grey lines on the maps & dirt roads.I'm trying to keep the nastyies out of the engine..also resale value is always in the back of my head too ...recently traded my 02r towards an 04ra & the dealer was happy to see a 99% stock bike ..so I try to keep mods "unboltable" perhaps when the new bike is outa warranty it'll get the cat eliminator which is collectin dust in the shed

You're a purist Savant. I decided against the SJBMW mod when I saw the price. I thought K&N's were supposed to filter better, but in any case you could simply use a larger diameter paper filter of your choice. All my mods are reversable. The dealer told me they usually take all the mods off anyhow as used bikes are more salable when they look box stock. I doubt if they'd pay you anywhere near what a well modded bike would be worth.

mechanic savant · Post by **mechanic savant** » Wed Apr 12, 2006 12:26 am

I don't know if it's archived on this forum or perhaps ,ibmwr or the moa forum ...but there's a pantload of 411 on air & oil filters ,most of the research was done buy folks w/much bigger brains than mine (they also have access to allthe cool lab stuff) and a bunch of letters after thier names..So i'll defer to their wisdom...Seems like for all out performance yes a k&n willflow more air but the oem air filter is overbuilt anyway (allowing for poor maintainance and still being able to run ok) so buy changing your stock filter regularly you'lle be getting all the air ya need..Also on the subject of weight reduction it's been said that "you'lle never notice the difference 25lbs. or so makes on handling " and those critics are right !!! the biggest advantage ,in my oppinion ,as to why weight is important is,,,with a given gvwr. the less the vehicle truck m/c whatever weighs the more ability for cargo load..i.e. camping widgets,beer,tools,ice,air compressor&decent plug kit,etc...

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