Any experience with this exhaust?
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Hooked
2005 Vespa PX 150
Joined: 23 Feb 2010
Posts: 228
Location: Houston, Texas USA
Sat Jan 05, 2019 7:55 pm quote
Has anybody ever used this Prima pipe?
I am intrigued by the description.

"This is a non-expansion type, OEM-style, performance exhaust. This low-profile performance / road pipe gives you more power without the noise!"

I am using a SIP Road 2 (and have used a Sito+) but I would love to find something a little quieter without losing the performance of the SIP.
I wonder what the jetting would be.
https://www.scooterworks.com/Sport-Pipe-for-2-Stroke-Vespa-PX-150-Stella-2T-P12644.aspx
Member
'81 Special, '78 P150X, '13 LML Star 200
Joined: 30 Nov 2018
Posts: 33
Location: Ukraine
Tue Jan 08, 2019 1:40 am quote
Perhaps it will be better than the stock exhaust.
Just look at the pipe sizes & shapes. This Prima muffler will definitely not give as much performance as sip road 2.0
Ossessionato
05 Stella, '62 VBB, 76 Sprint V, 63 GL
Joined: 16 Jun 2011
Posts: 2037
Location: Chicago. Well, Evanston, but that's almost Chicago
Tue Jan 08, 2019 8:43 am quote
I'm with Roland. No expansion whatsoever, assume no double-wall construction, so it'll be louder & slower than a Road 2.0, I'd expect.
Molto Verboso
1979 P150X, 1983 P200E, 1987 T5, 1996 PX200E, 2011 Yamaha Fazer 600 S2
Joined: 02 Aug 2015
Posts: 1432
Location: Veria, Greece
Tue Jan 08, 2019 11:18 am quote
I don't know anything about the Prima, but if you want something quieter without losing performance, the Polini Original BOX is probably what you need. I have it on my Ratty o-tuned, longstroke PX200 and I'm very pleased. Better than the Road 2.0 in terms of quality and performance and close to stock sound...
Hooked
2005 Vespa PX 150
Joined: 23 Feb 2010
Posts: 228
Location: Houston, Texas USA
Tue Jan 08, 2019 7:47 pm quote
SaFiS wrote:
if you want something quieter without losing performance, the Polini Original BOX is probably what you need. [snip] Better than the Road 2.0 in terms of quality and performance and close to stock sound...
Thanks, that sounds like exactly what I want.
Is it this one that I found at Scooter Center?
(I can't find one in the USA.)

https://www.scooter-center.com/en/p2002018/exhaust-polini-road-box-vespa-px80-px125-px150-166cc-177cc?number=P2002018

On the page it says "TIP: in comparison with the SIP Road, the jets hall be 2 or 3 sizes bigger in order to get a richer mixture."
(I guess that should be "shall be" not "hall be")
Would it be the same if I'm moving from a SIP Road 2?
That seems like a lot to me.
I already went up from a 98 to a 102 for the SIP.
Member
Vespa super 150
Joined: 08 Jan 2019
Posts: 41

Mon Jan 14, 2019 3:11 pm quote
How serious are they about the FOR RACING ONLY disclaimer on the road 2.0? I see that on every other after market part on the SIP website.
Molto Verboso
1979 P150X, 1983 P200E, 1987 T5, 1996 PX200E, 2011 Yamaha Fazer 600 S2
Joined: 02 Aug 2015
Posts: 1432
Location: Veria, Greece
Mon Jan 14, 2019 3:29 pm quote
Humanbean wrote:
How serious are they about the FOR RACING ONLY disclaimer on the road 2.0? I see that on every other after market part on the SIP website.
Laws are strict in Germany. Anything that's not original to the vehicle, or doesn't have a TUV / ABE / KBA approval from the "German Road Safety Dept." is not road legal, so SIP claims it as "FOR RACE ONLY". This way they have no liability issues towards the government or insurance companies. They have recently announced a road legal SIP Road 2.0 (it has an end silencer) and somehow they managed to have a Malossi 210 kit approved as a road legal version...
Member
Vespa super 150
Joined: 08 Jan 2019
Posts: 41

Mon Jan 14, 2019 4:22 pm quote
SaFiS wrote:
Humanbean wrote:
How serious are they about the FOR RACING ONLY disclaimer on the road 2.0? I see that on every other after market part on the SIP website.
Laws are strict in Germany. Anything that's not original to the vehicle, or doesn't have a TUV / ABE / KBA approval from the "German Road Safety Dept." is not road legal, so SIP claims it as "FOR RACE ONLY". This way they have no liability issues towards the government or insurance companies. They have recently announced a road legal SIP Road 2.0 (it has an end silencer) and somehow they managed to have a Malossi 210 kit approved as a road legal version...
Neat, if I were to get one and install it in a VBC Super 150 would I need to do anything else? Like getting different jets for my carb? I'm assuming everything on my bike is stock.

Also would there be an appreciable difference in performance?

Sorry to hijack OP's thread.
Enthusiast
Joined: 14 Jun 2016
Posts: 81
Location: Macedonia
Mon Jan 14, 2019 5:42 pm quote
Another vote for the Polini original Box!
I borrowed it from a friend to test it on my Malossi 166, and it ran great. It likes to rev with this exhaust even though its a box exhaust.

I liked the sound also. But its definitively louder then stock!
Hooked
2005 Vespa PX 150
Joined: 23 Feb 2010
Posts: 228
Location: Houston, Texas USA
Mon Jan 14, 2019 7:35 pm quote
jocco wrote:
Another vote for the Polini original Box!
I borrowed it from a friend to test it on my Malossi 166, and it ran great. It likes to rev with this exhaust even though its a box exhaust.

I liked the sound also. But its definitively louder then stock!
But what about the jetting?
Should it really be 2 or 3 sizes larger than the Road 2?
Member
Joined: 14 Jan 2018
Posts: 6
Location: Houston, TX
Mon Jan 14, 2019 9:23 pm quote
Lots of votes for the Polini box. Looks like a winner....

.

auspufftest_polini_box_vs_sip_road2_p2002018_.jpg

Enthusiast
Joined: 14 Jun 2016
Posts: 81
Location: Macedonia
Mon Jan 14, 2019 11:01 pm quote
Aiosi wrote:
jocco wrote:
Another vote for the Polini original Box!
I borrowed it from a friend to test it on my Malossi 166, and it ran great. It likes to rev with this exhaust even though its a box exhaust.

I liked the sound also. But its definitively louder then stock!
But what about the jetting?
Should it really be 2 or 3 sizes larger than the Road 2?
I had a simonnini before I tried the polini box, so I didnt correct the jetting, but it makes sense to need to go richer then the sip road since the polini makes more power.
Hooked
2005 Vespa PX 150
Joined: 23 Feb 2010
Posts: 228
Location: Houston, Texas USA
Tue Apr 30, 2019 8:03 pm quote
Any experience with this exhaust? - Update
I got a Polini Road Box today and after a bit of trouble getting it mounted here is a brief review.

Wow!
You know that feeling you get when you switch from the stock exhaust to a S.I.P. Road 2 or a Sito+, that extra bit of power that was lacking with the stock exhaust?
Well this is just like that.
But I went from a S.I.P. Road 2 to the Polini Road Box and got that same feeling... with even more power!
And the sound is so much better. A lot lower bass note tone and much quieter.
A very mellow, quiet, almost rumble.
I have nothing but praise for the Polini.
I'm still a little unsure about the jetting though.
I went up from a 102 with the S.I.P. Road 2 to a 105 with the Polini, as Scooter Center recommended.
I'll run it for a few days and pull the spark plug for a look-see.
But right now it feels like it is running great, and I didn't even have to reset the idle.

As far as the trouble getting it mounted...
I have lost count how many times I have switched out the exhaust, now that I am on my 2nd PX, and this one was the toughest one yet.
Usually it's a 20 - 30 minute job. This one took me almost 2 hours before I got inspired.
I could not get the @#$% bolt through the bracket.
Off the scooter the bolt would go straight through and thread with no problem.
On the scooter I could get a 1/4 x 6 inch extension to go straight through, but not the bolt.
So I took the bolt and filed the pointed end to a sharper point and shazam, it went right in.

So my final word is...
If you are thinking about replacing your exhaust, definitely get a Polini Road Box!
Addicted
'64 Motovespa 150S (177) , '76 V90 ( 133)
Joined: 27 Mar 2013
Posts: 539
Location: S.Salem, NY
Wed May 01, 2019 3:10 am quote
I put one of these Primas on my DR 177 and it does perform pretty well. Louder than stock but way less than the Sito+ I had tried, but still too loud for my aging ears. The Sito lasted one trip to town and back.

I'd like to know how the Prima compares to the Road 2 , sound-wise.

I have wondered if a lot of the sound from these boxes comes through the box itself and if it could be made quieter by welding plates on the top and bottom ? Or...Is there a silencer can which could be stuck on the tail pipe that would not mess up the performance too much ? Could you trade some power for some noise ?

Has anyone ever done a cut-through of the different boxes to show the internal construction ?

DSC03842.JPG

DSC03843.JPG

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