The best replacement for exhaust is muffler.

The best alternatives to exhaust are rated as following:
★★★★★  muffler
★★★★  intake
★★★  ignite
★★★  single exhaust
★★  dual exhaust
★★  single
★★  intake fan
★★  slip on
★★  cold air intake
★  intake first
★  magnaflow
★  aftermarket
★  intake side fan
★  full exhaust
★  stainless
  2.5
  fresh air
  intake case fan
  second hand smoke
  intake fans
  3 inch
  3 exhaust
  cigarette smoke
  magnaflow exhaust
  just muffler
  coilovers
  flowmaster
  vance and hines
  dry exhaust
  catalytic converter
  2 into 1
  2 1 2
  baffled
  h pipe
  ignite support
  yoshimura
  gasoline exhaust
  straight pipe
  headers
  dual
  borla exhaust
  full system

Your alternative for exhaust is not listed? Suggest!
Speaking about exhaust, one probably shouldn't forget about catalytic converter.

Other search terms related to exhaust and their ratings are:
★★★★★ catalytic converter
★★★ muffler
★★★ power commander
★★ intake
★ cat converter
★ headers
★ drone
★ turbo
no power commander
rejetting
cold air intake
downpipe
no intake
You have in mind a companion for exhaust and it is not yet here? Propose!



Google Trends

Scale is based on the average worldwide traffic of exhaust in all years. Click on graph for more.
exhaust
muffler
intake