Anyone whose actually done the holes in the air box then - do you find it makes a noticeable difference to noise?
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Anyone whose actually done the holes in the air box then - do you find it makes a noticeable difference to noise?
I've just added a stainless steel 4-2-1 manifold with integrated sports cat to my 1.8VVT, wasn't expecting a difference in noise as it still has the standard SRi exhaust system on but it now has quite a growl to it, it's addictive though so I fear my fuel consumption may suffer!
I guess getting a 2.5" exhaust made up will be best option. I wanted to go for but apparently they won't fit with the sri diffuser
Wouldn't think so,well id be careful how big you go for a 2.0T as you still need the gases to me moving fast and don't want them expanding and slowing down otherwise you'll loose performance. Unless its just noise you want.Originally Posted by cturner89
Vectra VXR estate 2007 Sapphire Black
Teapot Tuned 255/300
Eibachs B8's, fully loaded factory options
Tech2 & MDI diagnostics + SPS
If there's performance gains to be had I'd like that too. Wouldn't have thought 2.25 to 2.5 would be that much of an issue?
Of course it will, the air box reduces the noise, only did it on an old Vauxhall my first car, made a difference in sound.
So can I just get a universal air filter?
I drilled my airbox as it was strangling the engine when giving it the beans, my engine was modified and tuned up by Maptun though.. I guess it gave it more noise, i had a stainless quad zorst system, still had the centre box though..
Last edited by Caveman_nige; 5th May 2018 at 23:10.
the 100cpi cat made a significant difference, much more of a meaty sound from what I remember and performance increase of course..
How did you find mot time?
As my other car has 100 cell cat and takes ages too get it warmed up so its working well.
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