Noticed my GPF del pipe is way more blue near the very end where it connects to HKS. Is it normal or could it indicate my HKS is a bottleneck in my exhaust system as it cant let the hot gas out in time? Running HJS 300 downpipe and GPF del.
Theres no need to worry. I have a HJS downpipe and a full Whifbitz titanium exhaust with GPF delete and after 1 trackday mine went all blue from the downpipe all the way to the end pipes and my car is still on stock power.
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