GBS Silencer

[colinmoore]

Hi Guys, just wondering if anyone is running with the GBS large silencer. I'm getting headaches when driving the 2B because of the noise, even though I run a sport 200 cell cat in front of the original silencer. At around £300, non cat version they seem expensive, but if keeps the DB's at a lower level then perhaps it will be worth the expense. I'm running a 2.0 Duratec on throttle bodies, and my MOT station does not require emissions checked, so no need of a cat. 

[Guest MrToad]

I'm using Power Flow for my exhaust systems they were very reasonably priced and you can find fitters all over. They will design the units to suit you with different noise and sound characteristics plus they are stainless with a guarantee for life.

It's early days for my system as I only had it fitted and IVA tested late last year but it cleared the sound measurement with ease although my power unit is a turbo which cuts down the noise produced considerably and it is pre-cat. I've already had to test guarantee as welding leaked slightly and this was rectified without trouble. 

[theduck]

When @WallerZ has one his with the mx5 engine it sounded quiet as a mouse until he went full throttle. 

[colinmoore]

Yes it's  OK in cruise mode, but when the right foot goes down it draws the wrong type of attention.

[theduck]

Ah in that car you will what this type with plates in rather than just the perforated tube type

 

[nelmo]

I've got the GBS can and, if anything, I think it's too quiet 

However,  I'm more interested in 'my MOT station does not require emissions checked'  - please elaborate....

[colinmoore]

Yes it went though the IVA with a pinto, that didn't  require a emissions test due to year of manufacture. It was given a Q plate, the engine change was notified to DVLA, a updated V5 issued. At this year's MOT, I fitted the Cat in readyness for the emmisions, but was told it didn't need one. I didn't argue the point!

[theduck]

Depending on how the mot tester interprets the rules, a Q plate is visible smoke only for emissions at mot. 

[DeanRudkin]

I would get to Stoneleigh and have a chat with custom chrome 

[brumster]

Techcraft silencer here, they are well respected in the Locost racing scene as (i) they meet the noise requirements and (ii) are sturdy and repackable.

[WallerZ]

GBS silencer on my Mazda Zero was so quiet, they didn't even test it at IVA lol. Did a track day after around 5k miles and it was still only reading around 96db if I remember rightly. The problem is they begin to rattle as the perf tube isn't properly fitted into the tailpipe end. I've just stripped mine out, removed the (basalt?) packing and replaced it with Acousta-fil. But also, replaced the perf pipe and end caps so the perf pipe is fixed both ends.

Total cost of redoing the 2 silencers has been around £150, £100 of that was the exhaust packing which in reality, would probably have been fine without doing but I don't fancy messing about with it in the future - got bigger things to sort out - just need it to be quiet enough for a couple track days