hi mate yes i do notice it it is quicker cant give it to much right foot cos of the 5h1t headers i got they viberate on the subframe and hurt your ears . as for the expence to have it popin and banging i think your price is a fair price. that overrun can be a bit of a ar5e.but ha ho. if you want a surpurb job then yes mate it is i wouldn`t go any were else.