wouldnt it be a case of fitting the mixer ring simply onto the TB....

Depends.

One good example I can give you where this would not work is with an American-style carburettor system like an IMPCO or Gas Research system. These systems often require adapters and modified upper intake ducting in order for correct fitment of the mixer.

Regards,
Dave

Something most should be aware of some installers when doing a vsi setup will drill the manifold for the nozzles whilst manifold is on the car. Some will apply some grease to the drill bit to catch the filings others wont and will let the vehicle suck the filings through on start up.
Re upper manifold bolts this is a possibility. It's happened to me for different reasons but personally the design as it is i believe is a shocker. I think it would have needed at least another four bolts between the front and middle section and middle section and rear to make it seal properly.
I thought my 2001 pajero was a shocker to work on. I think the ford 5.0 injected setup is worse. lol..

Regards

yes i have seen the consequences of that.....a certain company starting with p and ending in ll couldnt prove it was the reason a 20,000km old alloytec had failed....think they had to pay for an entire engine rebuild....

That doesn't surprise me at all.

I know with my injection setup that certain company did take my manifold off, as NONE of the bolts were even finger tight, and one was missing outright! The car had a massive vac leak & i had to fix that myself before it could be tuned properly. Their so called mechanics tried to tell me the engine was too low on compression & that's why it was running badly. It was a perfect engine with perfect running & perfect vac before they touched it lol!

Cheers

ToranaGuy

Unfortunatly I was not aware of the Parnel Prins association and I had a Parnell mixer system fitted . What will it cost me now to convert to Prins I am fed up with backfiring .
Thanks in advance .

Basically it'll be a new install minus tank. Everything downstream of the tank is different. I don't think it's legal to reuse gas lines either.

Regards,
Dave