The exhaust also underwent significant changes over the last few years. i did a few experiments with it over time and eventually came across what i believe to be the best solution, given the requirement for a little back pressure, and the stringent as well as arcane local muffler regulations enforced by the men in khaki.
i initially had an APEXi world sport 2 muffler mounted, and that went away when @Supra_Natural and i exchanged cars for a weekend and he was stopped by the cinnamon gardens police. i was given 48 hours to put a "beat ekak nethi" barrell ekak and come back.
so i borrowed a stock EK3 barrel for some time and actually enjoyed the peace and quiet. during this time, i sourced an OEM ITR muffler, the gediya of which looked identical to any other OEM honda muffler, but was factory built as a low restriction exhaust. it gave a sweet note on high revs but was still quite restrictive.
the cutaway schematic below shows the subtle changes within the ITR muffler which differentiates it from the GS-R muffler:
of course this was still too restrictive for me, so i decided to experiment a little, and being true to my Darwin award winning self, decided then that the catalyic convertor was the issue and...broke it. breaking the cat was a disastrous idea. yes the car revved up faster and i lost a bit of the restriction at low rpm, BUT, the sound. oh dear lawd the blood curdling caterwaul. it sounded like the dying moans of a hundred sodomized polecats. it was dreadful.
having swiftly learnt my lesson, i then replaced the cat with an EG-6 SiR cat from a race spec EG-6 exhaust. as it can be clearly seen its a lot less restrictive and smaller than mine. <-- this is the spec GS-R cat. above is the EG-6 SiR II cat
later on, after sabry's rebuild, on his recommendation, i let sacha fetter with the piping, and got a full catback custom 2.5" exhaust system done by WEPR. this was mated to the ITR muffler until i had the final piece of the puzzle in hand, which was...
the Mugen Twin Loop!
this was a lucky find. i was shipping some other parts from Dubai (which i'll get to in the FUTURE PLANS entry) and the shipment got delayed because the crate which was made was too small. it took another week to make another crate, and in that time, some poor chap in dubai met with a grisly accident which completely totalled his built civic. it was a front end collision, and the car was wrecked. my parts hoarder friend salvaged this from the wreckage threw it into the shipment the day before it left for colombo!
i installed it and it was the bomb. quiet on idle, screamer in VTEC and so smooth. nothing quite compared to it. the joy was short lived, sadly, as i noticed the innards slowly coming out of the muffler and blocking the tailpipe. this was causing a tinny sound and a severe exhaust flow restriction. at one point i just went at it with a tyre iron and removed whatever steel wool and debris that came out. of course afterwards it started sounding like a proper tin can. it was unbearable.
many exhaust places refused to even touch it. my garage in attidiya was kind enough to at least open it up, as one way or the other it was done. this is what it looked like:
the inner workings were completely destroyed. i don't understand the logic of a company like mugen who makes such a good exhaust out of mild steel. they charge a premium for it when you spec the car with it, but it will only last you 5-6 years.
this is what it should look like:
after many palaces still refused to repair it, i had to finally goad Sacha into taking on the challenge. he ended up replicating the entire muffler, and the only piece remaining which he used from the old one was the tip! his finished product:
it now functions perfectly, is an utter joy to listen to, and is made completely of stainless steel, with a lifetime WEPR warranty. as far as exhaust tech is concerned, the mic has been dropped.
i will upload a video of the exhaust note and variations when i get the chance.
i also sourced the original integra brochure, which documents the 4 door sedan, and the MUGEN Integra add-on leaflet, which clearly shows the 4:1 header and twin loop as optional extras which can be specced from the factory while ordering the car. i have shown this to the cops twice, and so far they have accepted that its OEM. both times i was pulled over while idling and it was not for the exuast note. just simple dickery.