Roller bench and some casual drags are not the right ways to check the performance of a modified bike. Also, your approach towards building an exhaust is completely messed up.
You need to understand the exhaust working principle of a 2-stroke and a 4-stroke exhaust. You are building a pipe for your p220 with inputs from an RX135 project. Whats that? You wanna start a tuning shop and start building your own stuffs, then you better understand what tuning is what the basics are.
You cant quote figures from a roller bench and your approach is completely off.
Any free pipe on a 4-stroke engine will make the rpm climb quicker etc, but thats not tuning. Whats the difference between some pipe that you get in the market and from what you are doing? I sure wanna see a pic of your exhaust.
if you understand 4-stroke tuning in depth, you'll then understand how important gas dynamics are how much sound waves matter. In the depth of ignorance, its not a big deal.

The test which u are doing on roller bench has 0 wind resistance to get the true figures one has test it on a open road(public free roads), roller benches are a joke.

One of the best tuners i have seen in south actually prepares a graph of the current build be it car or bike and then the customer is given choices of picking up the desired peak power and rpm. i understand that you are in testing process now, but take these comments in a positive attitude and go ahead.

You are running a pipe on a stock P-220 or have bumped up in any case,

Testing without knowing the fundamentals is purely a way to go down. Engines are sensitive and the right inputs will ONLY work. A roller bench at a Bajaj dealer cant give you any real world data.

@psycho - Which tuner are you referring to. Do you think power figs are available like a catalogue to choose from? . Welcome to India!

Errr you know who it is better than me so lets not talk about it..

@ experts

hii..
iam not here to add fuel to the fire.. i just want to share the experience driving of prabhakar anna's bike... i was in the pbk waiting for my bike.. all of a sudden he came and after a while he said "have a test drive of my bike"..
i started the engine and was actually got afraid of the noise.. i initially thought the silencer was broken.. on the main road i opened the throttle only to find the bike revving very easily.. the bike was a bit smoother and i felt the power delivery to be great.. it was not like the local excessively loud exhausts which people put on to their bikes and call it FFE... i even felt the roll on to better than mine... after i came back i just asked him what he had done to his bike and how he could do that.. i know there are many many things involved for the techincal figures and most of which i cant understand.. but in simple words the bike was way better than mine in terms of performance.. i can say this as i own a p220 fi completely stock and after driving his bike, i felt the difference.. the difference maybe marginal but even this little difference should be appreciated and he should be encouraged more to make it a better one...
no offense.. cheers...

^The thing is, none of you have experienced a properly tuned engine and this is the word from a rookie.
FYI, you buy any dalda dabba from the market and shov...it will surely rev freely and make u feel you are going faster.
Sad that people here understand the least when it comes to technical aspects and hence even a product which was built with assumptions and vague ideas are considered great.

thats fine man.. u know things better.. but why cant u help him make a better exhaust? i mean even u will discover a few more things which u weren't aware of.

Common, I haven't seen probiker posting pics or dimensions or specs of his exhaust, even after asking for few times. how can any one help?
Even I am eager to learn some stuff.

Bike dealer and insurance guy.

I dont know what you are trying to say, but to let you know its not my business to help build a pipe for someone and transfer my tech for free...while the person in this case is planning to develop and sell his own stuff and make business. There is a limit to preaching and teaching things on the forum, beyound that its business. There is nothing that I'm gonna discover, expect for maybe learning how to build a bad exhaust . Thats something I'm never aware of.
I've been building my exhausts for over 3 yrs now and I know what goes into building one. Every engine demands a new dimension and to get the best out of an engine, you need to work on the cross sectional dimensions which is not a joke. Else its just another farting can.
The exhaust dimensions will be different for a stock engine, a cam'd engine, big-bore, head worked engine, high-comp engine etc. You cant make one "one size fits all" exhaust and call it a performance exhaust.
When a customer is putting down his money, he needs to get the best.

Joel

Petronas Sprinta 5000 on sale for 375/-

wat is?? fully synthetic?? rating ??better than sprinta 4t? better than motul 5100??? i would be wanting 2...

I do sell Motul also.
But Motul 5100 is Semi Synthetic.
Petronas Sprinta 4t 5000 is fully Synthetic.
Its 10w40.
It works for all the Bikes Except the Pulsar 180, 200, 220 & Avenger.

I'll be taking the delivery tomorrow as I'm on some other project Yesterday & Today.
U can collect them on Thursday.

Joel, seriously - if you're as good as you say you are, why don't you begin selling tuned exhausts to people in the community who are interested? I'm not doubting you, your long list of achievements and work speak volumes.

I know you race-prep bikes, but many folks would rather enter the engine mods foray with a simple plug and play job that can be easy to remove and revert to stock.

I didnt say anywhere I'm good or bad sir. Yes, I'm working on this bit.

The Website will be launched this weekend.

Will post the link once Done.