downpipe and delete regolator pipe sound

[Philip Park]

when i change oem downpipe for catless tuned downpipe

it's so exhaust smell is not good

so i change middle pipe ( regolator ) on 400cell type thunderbolt catpipe it

in 80mm , out 80mm center 100mm (4")


now i don't have trouble about smell. and can up and down window driving









here is my exhaust sound when i change catless varible change straight pipe it oem exhause end muffller

[m5 guy]

That's awesome. I've been thinking of a similar solution. I like catless downpipes for the heat reduction and quicker spool. I hate catless downpipes because of the smell. Great job!

[Philip Park]

Originally Posted by m5 guy

That's awesome. I've been thinking of a similar solution. I like catless downpipes for the heat reduction and quicker spool. I hate catless downpipes because of the smell. Great job!

yeah also i do

it smell too much terrible

so i change veriable directly straight pipe or cat type pipe use it