your engine is 'a little noisy' because you have a Cosworth-engineered 16v cylinder head.
Auto Trans or Manual, it makes no difference. this is a performance car, developed to rival BMW's M3 and as such its high-revving twin-cam engine can't really be compared to the other 190's, 2.6 included.
new engine mounts and a thorough inspection of your exhaust system could help quieten her down a little, but maybe you should sell the car to somebody who's after a 16v and buy a 2.6 Auto.
btw, my Auto 190E will often reach 5700rpm in 3rd before shifting up to 4th if i push it hard enough...
