Just a (lengthy) note from another new user. Just received my GPR GPE slip-on for my K1200R. http://www.ebay.com/itm/EXHAUST-SYSTEM- ... 06&vxp=mtrSome initial thoughts:
1. The unit wasn't ordered with the "DB Killer". Unfortunately, that means, according to GPR, it comes with NO DB Killers - rear or front (perforated cone)
. Based on my emails with them since the muffler arrived (VERY fast responses BTW), they indicate that when ordered with 'the' DB killer, (30 euros) ones gets BOTH types. No DB killer means - neither uder the assumption user is going for a 'race'(or non-EU homologated) configuration. Sort of makes sense, and I should have ordered the DB killer for rear (to give me options) but a bit of PITA. I suggested they clarify their ads accordingly.
1A The parts kit you see pictured on various Ebay ads is a GENERIC kit. My K1200S/R was labeled as such, but no rear DB killer, use the existing pipe clamp, odd extra bit (see below) etc.
2. The connecting pipe for my '07 K1200R was a bit too long from where it slips into the muffler down to the spring loops. The springs (I got 2 not 12 ;>) were stretched like no tomorrow and it placed the muffler (which is tapered) too far rear-ward. The clamping strap just didn't want to get a good grip on the pipe as a result. I had 5/8" cut off at a local muffler shop. It fits better, but probably could have gone as much as 0.75 or 1". That said, see later
3. The new GPR-side of the exhaust 'ball joint' (sigh...) didn't fit quite as well as the stock water-boiler unit's. Once clamped (must use existing clamp), I have a small
low-pressure leak (no sealant used) where the clamped 1/2s meet. Makes sense as when you look at pipes, there will be some slight back pressure there. Under the assumption that the clamp has something of a crimping effect, I'll rotate a touch the clamp, re-secure and see if that helps. If not, will use some O2 Sensor-safe HT RTV (or high-temp anti-seize) on joint and re-assemble. No biggie - very small leak.
4. Exhaust looks nice, well made. The black 'anodizing' does scratch easily, but knew that going into it.
5. Running no baffles it has a rich, deep sound with a minor burble on over-run. Not as MotoGP-like as our Termis did on our various Ducs over years, just enough to remind you (decibel level aside) it's not the stock Scud back there. Don't care about any minor performance increases (or lack there of).
6. The sound is probably
a hair too 'robust' for my normal use (says something about what our Termis were like, but I'm also older now...) , so will order the DB Killer(s ?) and insert just the rear one to just take the edge off. If a bit too tamed, will just drill some small holes in rim of the rear baffle to decrease the back-pressure a tad.
7. I received some odd extra parts that LOOK like they were designed to lower the pipe or shift it rearward a hair (small figure 8 connector with two mounting holes - but one bolt, washers and nut and stock nut us trapped to OEM muffler... ;> ). It would only lower pipe maybe 3/8" - 1/2" when all said and done and, in hindsight (duh), allow the pipe strap to clamp together FAR tighter, so will try that[/b].
BMW's typical "using how many custom parts & how weird can be do this ?" manner (we've owned R1150R, R1100S and two R1150GSs in past)
in designing the muffler hanger/pipe connector (I'll ignore the #$%^ who designed the looks of the things) results in a very thick receiving mount for the strap and this limits it's ability to clamp as tight as would like given pipe is tapered. That said, given the "...torpedo in the water...!" size & weight of the muffler (my $%Y^ it weighs a ton vs. the GPR), it probably needed a massive, rubber-isolated mounting point.
8. Instructions sucked - but that's no shock (ordered from MV Tech lately?) it's not brain surgery. Sole head scratchers are/were why no 'base' sound baffle in kit and what were the extra, not-so-obvious-use parts for?
Above may sound critical, but the pipe is very nice for the price and the shipping FAST and cheap (Italy to my hands in Nova Scotia in 5 days for $20). Customer service is very prompt - send emails on Friday afternoon (Atlantic time), responses in my mailbox early next day. Their English was FAR better than my Italian.
The muffler is well constructed, light and looks smart, but some more QC and attention to detail on fitment of the connecting pipe and why parts A,B, C were or were not in bag would be nice -- you may have to channel your inner McGyver a bit.
I'll tweak it, run it for the season and may move to another Akra, Remus, etc unit next year - or may not. Given how #$%^& mind-bending and smooth this bike is, all I wanted in an aftermarket pipe was to start the process of de-uglifying the rear end (some form of replacement hanger is next), drop any weight I could (grab rails already gone - wife has own bike) and get rid of the sewing-machine on 'roids sound of the beast.