to be honest, i have a us b34 without cats ... boring. i don't need another speed demon, and don't want an e9 of that type. i drive a 997 c2 - 911s everyday ... its very quick and i can't drive it at 10/10ths, but it will do everything and more that i need. think about the difference between a 2.9L cayman or a 3.4L cayman s ... if you got the base cayman and find yourself winding it out more to get the performance that you want / need ... you bought the wrong car as you will probably wear it out quicker.
years ago i had a 2002 with a high compression / high overlap cam that made a lot of power the faster it turned ... and it never quit until its 7000 rpm redline ... idled like a muscle car. it was quick in a straight line and carved turns like it was on rails. it was way too tweaked to be civilized on the road ... but it would keep up with anything in the twisties. what it missed was low end torque. it had 1.625" stahl headers and a 2" exhaust and combined with the schrick 316 + dual 45 dcoes and 10.5:1 custom pistons and a lot of head work (korman can build a stout engine) - had dyno runs of just under 190 hp at crank.
that being said ... i don't want that in a coupe. i want to carve turns and power through them. i want reliable power with something in reserve when i need it. i want what the car was conceived to be, in slightly more modern terms - a little better suspension, a little better brakes, and a little more power. the euro b34 with a schrick 284 and motronic 1.3 efi will be very reliable and efficient ... with 240 hp +/- for a very reasonable price. your mileage / wishes / dreams may vary
This is some interesting discourse and relevant to me also and hope this is not seen as a hijack of the thread and hopefully relevant to James and others reading this thread. I take on board the feedback and relevant to the reply above from rsporsche I am primarily looking for reliable running, fuel efficiency and power in that order for my E9. I already have reliability with the twin weber 3.0 I have in my 2800cs now, but geez does it go through gas! Per this thread I do have the US B34 and I know it to be a strong motor. I kept it to keep my options open and wanted something as close to period to go into my E9. For that reason I did not think I should go to a B35 whose airbox is starting to look too modern in my opinion. Of course I could keep the original airbox I guess.
So here is my question to clearly people with more experience than I...
@rsporsche @sfdon I have both these available to me: M30B34 with 170psi consistent compression and M30B32 with 182psi consistent compression. I removed both carefully so have everything to complete a very nice transplant. I do have the option of transferring a Callaway Turbo to the B32 but am less committed to that as I am not building this car for speed. I really was just going to go the turbo route for wow factor BUT dislike how that starts to clutter the engine bay. I could also go the route of M90 or B35 because have not started my build yet so now is the time to decide. So here come the questions:
- Which of the above would be the best basis for a build? (each to their own I know, but I am curious)
- What is the biggest benefit of going Motronic? (My father's Alpina was pre-motronic and was a silky smooth motor and I liked that it is easy to adjust/optimize timing if I were to change cams etc).
- If I go Motronic, there is word of the Motoronic 1.3. Is that was came with only the B35 and what is the benefit there?
Thank-you and hope this insight helps others.
If I want to smoke people, I will reach for another weapon of choice hehehe as the E9 will never be the one to leave everyone behind at the lights. However, it will likely get the most looks 
