CST powerbox exhaust for RT230?

[shawit]

Has anyone tried a BGM clubman and a CST powerbox exhaust on the same RT225 / 230 engine which has a 30mmPHBH?
Based on comments from 1 person I'm inclined to go for the CST powerbox but want to know if others found a difference.
There is quite a price difference!

[Rich Oswald]

I have Avanti Ex Box ST on my RT230 Reed, which is great. The only feedback i've seen from mates with the CST Powerbox is a 1bhp increase in power over a CST3 on a TS1.

Rich'

[Knowledge]

I am not surprised that the Powerbox is more money: there is a lot of extra work in the CST item.

It’s the first time I’ve seen this pipe. Thanks for bringing it to my attention.

I’d be interested to know how loud it is compared to the BGM or an Avanti ST box pipe.

[bookertmgs1]

The main concern about the Powerbox would be the actual main body of the exhaust. Anyone know whether its a convereted BGM or a SIP clubman thats used.

The interior baffles of the BGM pipes don't have a massive longevity in my experience (mostly V3's - but had the same issue on a V4)

I've started having them split / repaired / welded back up - but there is only so many times you can do that - plus its a pain when they come lose as its spoils the ride / trip. The V4's had additional baffles which reduced the performance too. If its the V4 BGM they are using - then be interested to know how this is being circumnavigated.

At £485 - i'd want some sort of reassurance that this is being stood up by supplier / manufactuerer for more than a season.

[bike grim]

Do they look like a bit of a bodge up? …be honest. They also retain a weak spot (in my experience) on the header where weld crack. I have suffered on more than one occasion on 2 different CST pipes.
How do they get around the “gassing up” issue that the BGM suffers from due to the narrow tail pipe on a big CC motor?
I have seen one fitted up close. It looks like the V4 BGM to me.
I’ve heard a clip of a Quattrini running one and it sounds like a BGM - which is a positive.

[Rich Oswald]

The main concern about the Powerbox would be the actual main body of the exhaust. Anyone know whether its a convereted BGM or a SIP clubman thats used.

The interior baffles of the BGM pipes don't have a massive longevity in my experience (mostly V3's - but had the same issue on a V4)

I've started having them split / repaired / welded back up - but there is only so many times you can do that - plus its a pain when they come lose as its spoils the ride / trip. The V4's had additional baffles which reduced the performance too. If its the V4 BGM they are using - then be interested to know how this is being circumnavigated.

At £485 - i'd want some sort of reassurance that this is being stood up by supplier / manufactuerer for more than a season.

Don't quote me on this as I am not 100% certain but I think you are right in that it's a converted BGM.

Rich'

[martyn dwane]

From Chisel speeds website.
.THEY ARE BLENDED FROM OUR USUAL HEAVY DUTY SHEET STEEL AND A BGM EXHAUST BOX TO GIVE THE CLASSIC LOOK BUT NO LACK OF PERFORMANCE.

[Rich Oswald]

From Chisel speeds website.
.THEY ARE BLENDED FROM OUR USUAL HEAVY DUTY SHEET STEEL AND A BGM EXHAUST BOX TO GIVE THE CLASSIC LOOK BUT NO LACK OF PERFORMANCE.

Thought i'd read that somewhere, thanks Martyn.

Rich'

[nsaints]

A year on any more feedback on this exhaust?

I’ve an RT230 reed. The BGM V4 has a loose baffle.

Be interested in performance versus BGM, does the CST use 4 hole flange fitting and longevity.
Thanks.

[Mikedale]

following this post, would be intersted in comparison to bgm v4 and avanti st

[nsaints]

Bit off topic
I’ve since been recommended by several people including dealers the SIP clubsport curly

It fits using the 4 hole BGM manifold which is a plus, far cheaper than the CST exhaust.

Fit not as good as the BGM V4. I’ve had to use a couple of 8mm spacers so as not to stress the exhaust bolting it up.
Not noisy, at least no more than a BGM

Not really opened up yet as running in new rings.
Early indications are good