4-2-1 manifold + de catt help !!!

[b47to]

The setup i currantly have on my car is the standard manifold decatt then my sports back box

Im looking into gettin a 4 2 1 off my m8 for £80 but hes saying rather than have it stright threw i should have my 4 2 1 a powerflow middle box then my decatt then my back box hes saying i need a middle box because the micra works on back preasure is this true or am i best sticking to 4 2 1 and decatt for the best performance or stick the middle box in ?? Please help

Thanks in advance !

 

[squarepants]

it will be fine without a middle box...if you loose to much back presurre just put your standard cat back in..but i dont think you will need it.

 

[b47to]

How will i know if i lose back pressure ? N does £80 sound good for a 421 ?

 

[squarepants]

yearh £80 is about right for a used one...you will know when you loose back presurre..just try going up a hill, it will be worse at pulling than standard. but it should be fine. TBH i would fit the standard cat but thats me. it will sound loud and raspy with the de-cat & 4branch manifold inplace.

 

[jowley]

u dont loose much back pressure theres too much anyway mine ran a ot better with a straight thro system

 

[b47to]

thanks for your help