A TX autosport tophat with a DV takeoff comes will a solid boost pipe for the map sensor built in. I blanked mine off as i was using the standard take off on the intercooler pipe.
http://www.ebay.co.uk/itm/Astra-Zafi...item19fdff4206
As for an exhaust i got a Miltek cat back non-res. sounds pretty good to be fair but i also recently got a pre-cat decat when i had my clutch upgraded. now that was worth it. Much more lairy.
some people prefer other brands but i liked the sound of the miltek. tbh a custom powerflow system could be for you. all about presonal preference
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