4.0 tj engines

#1
Ive worked on both 1997-1999..and 2000-2006...why does the 1997-1999 feel like they are more powerful engines i.ve even seen the difference on dino..stock and mods
 
#2
supposedly the 2000 and later had a more restrictive exhaust which is why they started using the new intake manifold...or something like that. I dunno.
 
#3
The late 02's -06 have a 2pc header style exhaust manifold & Y-pipe with a pair of mini converters and a pair of updraft O2 sensors. Three cylinders per mini cat, and sensor. So there are 3 converters on an 02-06
Pic
http://i.ebayimg.com/t/2001-2003-Jeep-Wrangler-TJ-4-0L-Front-Exhaust-Head-Pipe-/00/$(KGrHqEOKi8E3K2jvGugBN-Lw)Yos!~~0_35.JPG
 
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