Yeah too many people seem to fixate on the fact that it's the piratebay. Some people like piratebay, some people dont, but for the sake of all of us I hope too many people don't like censorship.
Yes there are many things to consider when it comes to exhaust design. My posts were only about the exhaust size and about the consept of back pressure.
Some people go as far as build their exhaust systems and try different combos in dyno. But if you use any common sense you can't go that badly wrong. Every engine is unique (especially if you build your own one instead of using stock engines) so everyone of them has their own "perfect" exhaust size. Also the exhaust size depends on what RPM area you want it to be optimized. General rule is that bigger exhaust works better on higher RPMs.
I'm referring to a simple chart I found over the net a while ago:
170 - 240 hp = 2.25" - 2.5"
240 - 350 hp = 2.5" - 3.0"
350 - 500 hp = 3.0" - 3.5" or 2x2.5".
Don't take these numbers as a fact of the perfect exhaust size for your engine, but if you follow them it's probable that you will be able to avoid the worst over exaggerations.
I myself already know that I'm going to the 3" route for my next engine. But all I know about it that I won't be making a huge mistake and it should be ok for the spec I'm going.
Yeah if you need to reduce sound I think best solution is a decent straight thru muffler. They basically dont add any or just very little back pressure because the pipe shape and size is still kept the same.
Exhaust back pressure wont add any compression to the engine.
Reason why you don't want too big exhaust is that a big exhaust adds pressure vs correct size kinda makes it's own "suction".
I used to think that back pressure was needed also some time ago, but didn't understand why it would be. Remember reading a short note about the exhaust sizing and how it is supposed to keep the velocity of exhaust gases at reasonable speed and it suddenly all made sense.
Exhaust back pressure is a myth. The reason why exhaust piping size needs to be correct is to help draw the air out from the combustion chamber. If exhaust is too big the speed of the exhaust gases slows down and this creates "back pressure" which is not good. That's why people talk about back pressure, because for most people it's commong sense that the bigger the exhaust the less there is back pressure.
Installing a muffler just to get more back pressure is utterly wrong.
Yeah if I've understood correctly Hondata is pretty much "bolt on" and then tune. Megasquirt requires some knowledge and willing to do stuff yourself but in the end Mega when configured right fits as good as to any other particular vehicle. Of course I'm not familiar with Hondas so dunno how much work to make the Mega work and if there is any need for replacing sensors with different kinds.
Independent ECU's can be pretty cheap if you're willing on going thru the DIY route. For instance a Megasquirt I'd imagine would be possible to get for under 200 euros.
The clip in question has a quite bad distortion while the Mazda downshifts, but other than that it seems ok. There is something wrong but I'm getting the feeling it might only be because the audio seems to have been packed some amount. Maybe the original recording was much better.
The weird thing is that this exact song always ends up playing in my and one of my friends head when we work on our cars together. Or at some point the other one will hum it accidentally and then it starts to play again. At this point we realise it will haunt our heads for at least the whole evening.