Hi all, the rear back boxes on my B10 are in very bad shape.
Alpina want £1800.
My way of thinking is 535i exhaust parts from the downpipes to the rear box and then an Eisenmann backbox (£1000 all in)
535i exhaust parts from the downpipes and I can get a new 540i box for peanuts and then get the innards modified close to Alpina spec.
My question is: will the 540i back box mate up to the 535i center silencer? Is this even a feasable option to obtain a good sound?