I'm interested at the Tarmac exhaust manifolds. I would like to know the
diameter of the primary and secondary tubes, and if is possible to fit it
in Vauxhall Calibra engine compartment? Alternatively should I have a 4
to 1 if the above manifold will not fit?
Answer: The tarmac exhaust manifold is still available and because the dimensions
of the Calibra engine bay are identical to that of the Astra, it will
fit in exactly the same way as the Astra engine bay. The diameters of
the primary pipes are 1.7/8" and the secondaries are 2.1/8".
The outlet diameter into the first part of the system is 2.5". This
was then stepped up to 70mm to match onto the works exhaust systems
I would not recommend a 4 into 1 exhaust manifold. It only produces peak
power and loses dramatic amounts of mid range and lower end torque and
our design of exhaust manifold is superior in every way.
I want to put throttle bodies & cams in a Calibra 2.0L 16v, will they
fit under the bonnet or catch on the brake master cylinder?
Answer: The throttle body kit MT196 will fit without fouling the brake master
cylinder. However you will have to move the brake pipes coming out of
the master cylinder using the brake mod kit supplied.