Just to let you know that as an owner of a car with BPM downpipe and HKS Hiper system that is very noisy, help is at hand.

You can purchase a baffle/noise trap for around £25 from HKS suppliers.

This fits in the rear megaphone (sorry tailpipe) and creates a small expansion chamber in the tailpipe and makes a huge contribution to noise reduction. Not as rich a symphony, but much more bearable for you neighbours, on track (I was 105db) and certainly on the motorway.

There is a straight through pipe in the baffle that looks rather smaller than the 12cm tailpipe - but this exactly matches the exit pipe from the rear silencer.

Also, after datalogging, the car seemed to be running almost the same to if there is a reduction in power it is less than 2-3bhp.

One downside is that it looks cack.

R - I can hear

 

Well, I *used* to think I had a hiper system, but it's apparently a Apex (or Apexi) N1 system. Regardless it's bloody loud, so I know how you feel.

I also could get a silencer for the system, and I am tempted to do so, but I like scaring the bejesus out of small kids, animals, old people, young people.........

Seriously though, I'm considering it as the beast is a tad loud. Can't wait until I get it on track as I though some of the cars a BH in october were a bit on the quiet side

huh? who said that

 

Ive got a Hyper madalion stainless system on my 95 wrx . Does anyone know if this is made by hks ?, it has jasma imbosed on the rear box. Thanks Graham.

 

Blimey Markus, whereabouts were you standing at BH? Sounded good and loud to me on the pit wall

Chris

 

Some were quiet.

Mine is 'KIN loud.

I dont care, I said I dont care !!

Just turn the wireless up a bit more, put your foot down a bit more and visit every multistory car park you can find.

Best alarm set off is 6 on the same floor at times2 car park in Sutton surrey.

Barge the DEAF 10 year old lol

 

Barge,

my rationale is practical - I was kicked off a track for being too noisy.

I need the choice - BUT the noise reduction kit doesn't seem to cost much if any power at all.

I can still set alarms off tho'

R

 

rannoch:
which track?
Reason I ask is that I know tracks do have a dB limit and whilst at brands I thought that the beast would be said to be too loud.

Chris.
I was also on the pit wall, there was someone with a Hiper/Super drager which was quite loud, forgot about that one! Maybe it's just my perception (maybe slight deafness ) but they did not sound *too* loud. Guess we'll find out one day.
Oh, and loudness was made up by Dom sticking the RB5 into third before the corner at the end of the start/finish straight. What a wonderful noise. The blackbeast would probably cough, splutter, and chuck gear cogs over the track if I tried it

 

Castle Combe measured 105db. 100 limit.

No problem at Donington tho' they are more practical!

R

 

What is the road maximum if there is one.

Si