Louder meaning exhaust loud or induction loud or music loud?
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the answer is clearly back box/cat back, or an i missing something?
Non resonated race tubes are on eBay for around £40 and a decat with 3" downpipe is less than £100. Not only will it be louder but will spool up and drive a bit better and also better for re-map potential. Also drilling holes is the stock airbox is a free method to improve grunt along with removing the bonnet lining. But if you want seriously loud then a straight through exhaust is the answer lol.
Non resonated race tubes are on eBay for around £40 and a decat with 3" downpipe is less than £100. Not only will it be louder.
No it wont unless you get rid of the standard back box.
All the noise is governed by the back box on these.
Exactly the route i have went down for the time being anyway, Aaron do you know if this set up with CM tip/ Jetex and SMIC be ok for a stage 2 map?
-3" Toyosports decat DP (100 quid delivered: www.ebay.co.uk/itm/140547954201)
-Non resonated catback (like Scorpion 315 quid: www.ebay.co.uk/itm/330535277215)
-Drill bottom side of stock airbox (free)
That should sort your problem