Ok with the shocks replaced on the car (Koni adjustable sports) I thought I was done spending money as the plan was to get the best usage vs invested dollar out of this car. That said...maybe a little fun wouldn't hurt as I keep missing the sub 50mph cruising of my 68 Mustang v8. I know its too different era but while the cruising is great in this car the sound is sleepy....literally. My soon to be fiance falls asleep on almost every road trip.
Question:
Besides for legal emissions reasons does my e34 540i need the cats? As in will I get error codes if they are gone? I dont know where the o2 sensor is so apologies for the novice question.
My plan
- cut everything past the head off
- 2 to 1 pipe
- glasspack/cherrybomb
- then qtp wireless 2.5in cutout
- dynomax vt single exhaust one way (has no drone valve) nothing the other
- tips meet up to look stock
I realize I will get zero performance gains but after riding stupid fast motorcycles and super slow classics that performance in the real world is perception. If you are having fun and enjoying the experience who cares.
Here is what it would sound like on the GP side
Here is two Dynomax VTs on my old car with a 302 with H pipe
They muffle considerably almost to the point of being boring which is what I want on the quiet side.
Will I use the QP side often or ever in a public or residential area...NO.
Will I love carving up backroads in the country and occasionally surprising someone...HELL YEAH!
So let's hear it! Let me have it! What do you think about having push button quiet or roar?
Cost Guesstimate
QTP $300
Dynomax VT $130
Cherrybomb $50
Custom fab and tip $300ish
Question:
Besides for legal emissions reasons does my e34 540i need the cats? As in will I get error codes if they are gone? I dont know where the o2 sensor is so apologies for the novice question.
My plan


- cut everything past the head off
- 2 to 1 pipe
- glasspack/cherrybomb
- then qtp wireless 2.5in cutout
- dynomax vt single exhaust one way (has no drone valve) nothing the other
- tips meet up to look stock
I realize I will get zero performance gains but after riding stupid fast motorcycles and super slow classics that performance in the real world is perception. If you are having fun and enjoying the experience who cares.
Here is what it would sound like on the GP side
Here is two Dynomax VTs on my old car with a 302 with H pipe
They muffle considerably almost to the point of being boring which is what I want on the quiet side.
Will I use the QP side often or ever in a public or residential area...NO.
Will I love carving up backroads in the country and occasionally surprising someone...HELL YEAH!
So let's hear it! Let me have it! What do you think about having push button quiet or roar?
Cost Guesstimate
QTP $300
Dynomax VT $130
Cherrybomb $50
Custom fab and tip $300ish