You're being ****y with someone that's trying to do right by you because they're not giving you the answer you've already decided you want.
Coming from someone who has built and modded their own bike racing engines for the last 12 years, I'll let you in on a nugget of information you're obviously unaware of.
To make your car quicker, you're currently looking at the wrong part of the Rev range.
Play to its strengths. Who cares what the peak HP number is.
It's all about the area under the curve, the spread, how quick it adds revs, and gearing.
Ignore it if you will, but you're currently barking up the wrong tree, and will throw a lot of money at it for sod-all gain.
If you were serious about the performance , you'd put the stock airbox back on as Fahad suggested.
If all you care about is being able to say you have a 200hp diesel, you may as well photoshop yourself a dyno printout, and keep it in your wallet for showing your mates at the pub.
At the point your motor's even making 194ponies at the moment, you're way past the point at which you should've changed up a gear and ridden the torque curve more.