Best bet for this small market niche item
for all you C4 fans, this is a great replacement for the 90-93 accordion tube.
It's made out of vulcanized rubber, not plastic as a previous review suggests.
It's also the right size to fill the gap between the air cleaner housing and the throttle body - much better than the stock accordion duct (which runs a bit short and therefore tends to pull away from the air cleaner over time).
Dyno - I have no idea. If you're putting your 28 year old C4 on a Dyno you have way more free time (and money) than me.
Bottom line - it's the only game in town for aftermarket intake replacement for the 90-93 C4. Does it cost more than it should - yes. Is it better than stock - yes. Worth it? to me - yes. No more air leaks between the filter and the throttle body.
Verified purchase: YesCondition: New