Question:
i)What are the benefits of a "swirling" type bullet
ii) Why are there "longer" and "shorter" swirling bullet?

Currently I already have a MUGEN Twin Loop exhaust (and mine is not VTEC engine) on my 1.3L with stock piping and stock center box.I find the twin loop did improve my low-end torque until 4000RPM but after that, the engine struggles to meet the 6000RPM. Sometimes it will be stuck at 5500RPM for a long time.

So the exhaust "specialist" suggested I get the "swirling" bullet compared to normal "RM 90" bullets, apart from enlargeing the pipe.

This post has been edited by SleeplessEyes: Aug 20 2007, 10:57 PM

That is what I wanna hear, the truth is out there and now the truth speaks for itself. Thanks SoulFly.
Okay, that really clears the air of my doubts cause the exhaust shop man (a 40-ish year old man) keeps promoting about this "swirling" bullet.

I keep on searching in Google for "swirling bullet" and only found 1 which basically praises the product itself. Damn.

So from your answers, I should either:

i) Get a straight flow bullet (and I think thats the cheapest)
ii) Straight Flow mid box, but fear it will be noisy. A little noisier is acceptable, but excessive noise enough to drown my ICE is not acceptable.

and enlarge my exhaust piping to around 1.8".

OK, now where can I find this (or equalvalent)





I have a feeling this stock standard bullet is really "empty" (no fibre) at all.

This post has been edited by SleeplessEyes: Aug 22 2007, 10:04 PM