A tune is absolutely not necessary for bolt on's...that being said i noticed a big increase in smoothness at low rpm and increased responsiveness. Overall it made a difference and I was skeptical before doing it. I gained ~30 ft-lbs at around 2300 rpm... which is ~13.3% increase. no big deal as far as max is concerned but believe me it makes a huge difference in drive ability. Ppl alot of times only give heed to "max numbers" well i cant stress enough how how important it is to look across the entire rpm range. Bottom line, if you notice any choppyness and are not satisfied with driveability then yeah do it. If your ride is already smooth and your just looking to show off max numbers don't chances are youll probably wont be at any mind blowing numbers in the 1/4 mile or anything.
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370z NISMO 0675 327 rwhp 280 rwtq - sold.
FD RX7 single turbo 508hp - sold.
Lexus IS-F 5.0L V8 
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