but the idle does seems better. My bike calls for a gap spec of
593439
I'm not sure about other motorcycles (Yamaha FZ6R), but I found out that you have to unscrew the little caps on top of the plug or the plug wires won't seal or make the correct electrical contact.  It doesn't take much torque or pressure to loosen them up.  I took my pair of pliers and gently held while I rotated and it came loose right away.  The install went seamless.  I've only traveled less than 30 miles to date with the new plugs and the K&N filter, but the idle does seems better.  My bike calls for a gap spec of .7 to .8 mm and they came in right at .7 from box.
507853
Seems to be working according to  specs.  Hard to tell for sure as the amount of idle speed correction is small when steering is operated.
3157687
My engine still runs, so that's good!  All were pre-grapped at 0.050, though 1 of them was smaller than that.  You may want to throw down $1 on a gapping tool to double check.
730433
I bought this for temporary use till spring/summer 2018. Ive bought the K&N short ram intake but waited too long to install while now  winter is around the corner.. so Far Ive not notice anything different with this install. Not sure if Any horsepower gain, but stepping on  the Gas hard, seems like sucking more air in..?  Dips quicker ? Might just be me thinking highly of this product... OVERALL this item was easy to install, for the price, it is way cheaper then getting a cotton filter from dealership..
3506287
As advertised and as expected.  Strangely the gap was not set to the spec for my motorcycle, and I read these are not to be gapped, but i had no choice as the bike would not idle until i set the gap.
2936774
Installed prior to beginning a long trip that is currently in progress. I'm happy the exhaust note volume and happier with the 3 or 4 mpg I have gained though I can't explain how ! Had to work a little with bolt alignment but it fits well.
1171484
Below 3k rpm it has a nice throaty sound. Wide open throttle is s bit loud for my taste. First mpg comparison was very encouraging, bit need a couple more tanks to confirm.
2578157
I have a 98 4runner. I bought this replace my o2. I notice the idle would dip when coming to a stop even after the cat was replace since it didn't pass smog. I didn't have that dip after the replacement and I pass smog with flying colors.
2926133
I didn't notice any hp or fuel economy improvements over the stock unit. If there are any increases in hp you will need a dyno to confirm it because it's not enough to detect during everyday driving or even hauling a trailer. It's also much more noisy than the stock one, but I knew that before I bought it and plus you'll get used to it after a while.
1246669
used for my 2009 HD sportster 883.  I have noticed clear difference of engine temperature.  much cooler than before.
and less engine sound meaning smoother engine operations.
2847019
Saw little improvement in cushion from the stock saddle that came with my bike. Quality does seem a bit nicer, however, and I also appreciate that this saddle is a little thinner and has the slit in the middle of the seat for, well, aeration. This seat slants slightly downward compared to my current seat. I am guessing this is for street bicycles where my bicycle is a street/mountain hybrid. this seems to force me to put more work into my pedaling, which is a plus in the exercise category and a con in the the distance category. I am not sure whether or not I will keep this saddle on my bike, revert back to my old one, or try another one out. My middling opinion on this saddle is why I am only giving it 3 stars.
1208880
I have it installed on my 16 F250 and I don't get any better fuel mileage but I can def feel the power difference
1782305
Put some umph back into my GTI. Feels like the throttle is more responsive. Feels more aggressive.
1811223
Slight seat of the pants smoothness on coasting.  Drove 800 miles with 3/4 bottle in SUV.  Ride felt smoother and mpg improvement was negligible.
473757
Recently I put a set of four of these plugs into my 2005 Toyota Corolla LE, and saw positive results immediately. My Corolla has idled consistently at 750 rpm since I bought it nine years ago. The only changes made were installing the set of new plugs, and a new serpentine belt. So, I feel it reasonable to attribute the fact that the car now idles at 950 rpm (a 26% increase) to the new plugs. Having started sluggishly for a year or two (which I had chalked up its nine years of service), it now starts instantly like a new car. It also runs quieter (this might be the new serpentine belt), runs smoother, is more responsive and, I suspect, possibly more fuel efficiently as well. I will need to drive a few weeks before I can tell if the past nine years of a steady 30-32 mpg gallon, has been affected one way or the other. I can say that it seems to take less pressure on the gas pedal to get the same results though, so I would be surprised if mpg were not improved to some degree at least.
4601118
...and that's what I got.  I keep pretty good records so the fuel economy would have shown up.  Of course, I probably have my foot in it more now since it is pleasantly louder than the stock setup.  It's not offensive and my wife wouldn't have noticed it if I didn't mention it to her.  It really cleaned up the engine bay to get that giant box out of there.
3700996
Decent tone, manageable amount of drone, did gain almost 2 mpg believe it or not. It does feel like low end torque is a little higher higher in the rev, but not like your driving the newer 3.5. I definitely recommend this exhaust.